Most Repeated Maths Topics for JEE Mains 2026
The topics asked in the JEE Mains exam follow a certain exam pattern where some chapters are asked more frequently than others. Focusing on these JEE Main Maths important topics to strengthen your exam preparation and help in maximising scores. Given below some of the most important and repeated topics that students should prioritise for JEE Mains 2026.
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From the above table, it is clear that Linear Differential equation is the most important and repeated topic with 102 questions, the second is Area bounded by two curves with 79 questions. The huge gap between the first and second topics shows why we should give priority to the linear equation. Additionally, some topics like the Sum of n terms of an AP and the Quadratic Equation are often asked repeatedly.
Let’s go through the questions from each of the top 10 most repeated topics in Maths for JEE mains:
1. Linear Differential Equation
Question: If the solution curve of the differential equation $\left(\left(\tan ^{-1} y\right)-x\right) d y=\left(1+y^2\right) d x$ passes through the point $(1,0)$, then the abscissa of the point on the curve whose ordinate is $\tan (1)$, is
(1) 2 e
(2) $\frac{2}{\mathrm{e}}$
(3) 2
(4) $\frac{1}{e}$
Solution:
$
\frac{d x}{d y}+\frac{x}{1+y^2}=\frac{\tan ^1 y}{1+y^2}
$
Linear differential equation
Integral factor
$
\begin{aligned}
& \text { If }=\mathrm{e}^{\int \frac{1}{1+\mathrm{y}^2} \mathrm{dy}}=\mathrm{e}^{\tan ^{-1} \mathrm{y}} \\
& \Rightarrow x \times e^{\tan ^{-1} y}=\int \frac{\tan ^{-1} y e^{\tan ^{-1} y}}{1+y^2} d y
\end{aligned}
$
Let $\tan ^{-1} y=t \rightarrow x \times e^{\tan ^{-1} y}=\int \frac{t e^t}{I I I} d t$
$
\begin{aligned}
& \Rightarrow \mathrm{x} \times \mathrm{e}^{\tan ^{-1} \mathrm{y}}=\mathrm{te}^{\mathrm{t}}-\int \mathrm{e}^{\mathrm{t}} \mathrm{dt} \\
& \Rightarrow \mathrm{x} \times \mathrm{e}^{\tan ^{-1} \mathrm{y}}=\tan ^{-1} \mathrm{ye}^{\tan ^{-1} \mathrm{y}}-\mathrm{e}^{\tan ^{-1} \mathrm{y}}+\mathrm{c} \\
& \mathrm{x}=1, \mathrm{y}=0 \Rightarrow 1 \times \mathrm{e}^0=0-\mathrm{e}^0+\mathrm{c} \Rightarrow \mathrm{c}=2 \\
& y=\tan 1 \Rightarrow x \times e^1=1 \times e^1-e^1+2 \Rightarrow x=2 / e
\end{aligned}
$
Hence, the answer is the option (2).
2. Area Bounded by Two Curves
Question: Consider a curve $y=y(x)$ in the first quadrant as shown in the figure. Let the area $A_1$ is twice the area $A_2$. Then the normal to the curve perpendicular to the line $2 x-12 y=15$ does NOT pass through the point.

(1) (6,21)
(2) (8,9)
(3) (10,−4)
(4) (12,−15)
Answer:
$
\begin{gathered}
A_1+A_2=x y-8 \\
\Rightarrow A_1+\frac{A_1}{2}=x y-8 \\
\Rightarrow A_1=\frac{2}{3}(x y-8) \\
\Rightarrow \int_4^{\mathrm{x}} \mathrm{f}(\mathrm{x}) \mathrm{dx}=\frac{2}{3} \mathrm{x} \cdot \mathrm{f}(\mathrm{x})-\frac{16}{3}
\end{gathered}
$
Differentiate w.r.t. $\times$
$
\begin{aligned}
& \begin{aligned}
\mathrm{f}(\mathrm{x}) & =\frac{2}{3} \mathrm{f}(\mathrm{x})+\frac{2}{3} \mathrm{xf}^{\prime}(\mathrm{x}) \\
\Rightarrow & \frac{\mathrm{f}(\mathrm{x})}{3}=\frac{2}{3} \mathrm{xf}(\mathrm{x}) \\
\Rightarrow & \frac{\mathrm{f}^{\prime}(\mathrm{x})}{\mathrm{f}(\mathrm{x})}=\frac{1}{2 \mathrm{x}} \\
\Rightarrow & 2 \int \frac{\mathrm{f}^{\prime}(\mathrm{x})}{\mathrm{f}(\mathrm{x})} \mathrm{dx}=\int \frac{\mathrm{dx}}{\mathrm{x}}
\end{aligned} \\
& 2 \ln |f(x)|=\ln |x|+C
\end{aligned}
$
Simplify the logarithmic terms:
$
\ln |f(x)|=\frac{1}{2} \ln |x|+\frac{C}{2}
$
Exponentiate both sides:
$
\begin{aligned}
|f(x)| & =e^{\frac{C}{2}} \sqrt{x}
\end{aligned}
$
Let $e^{\overline{2}}=k$, where $k$ is an arbitrary constant:
$
f(x)=k \sqrt{x}, k \in R .
$
and satisfy the $(10,-4)$.
Hence, the correct answer is the option (3).
3. Dispersion (Variance and Standard Deviation)
Question: The outcome of each of 30 items was observed; 10 items gave an outcome $\frac{1}{2}-d$ each, 10 items gave outcome $\frac{1}{2}$ each and remaining 10 items gave outcome $\frac{1}{2}+d$ each. If the variance of this outcome data is $\frac{4}{3}$ then $|d|$ equals:
(1) 2
(2) $\frac{2}{3}$
(3) $\frac{\sqrt{5}}{2}$
(4) $\sqrt{2}$
Answer:
Variance -
In case of discrete data
$
\begin{aligned}
& \sigma^2=\left(\frac{\sum x_i^2}{n}\right)-\left(\frac{\sum x_i}{n}\right)^2 \\
& \sigma^2=\frac{\sum x^2}{N}-\mu^2=\frac{4}{3} \\
& \mu=\frac{10\left(\frac{1}{3}-d\right)+10 \times \frac{1}{2}+10\left(\frac{1}{3}+d\right)}{30} \\
& =\frac{1}{2} \\
& \sigma^2=\frac{10 \times\left(\frac{1}{3}+d\right)^2+10 \times \frac{1}{4}+10\left(\frac{1}{2}-d\right)^2}{30}-\frac{1}{4} \\
& {\left[\left(\frac{1}{2}+d\right)^2+\left(\frac{1}{2}-d\right)^2=2\left(\frac{1}{4}+d^2\right)\right]} \\
& \Rightarrow \sigma^2=\frac{1}{3}\left[2\left(\frac{1}{4}+d^2+\frac{1}{4}\right)\right]-\frac{1}{4} \\
& =\frac{1}{3}\left[\frac{3}{4}+2 d^2\right]-\frac{1}{4} \\
& =\frac{2 d^2}{3}
\end{aligned}
$
Now, $\sigma^2=\frac{4}{3}$
$
\Rightarrow \frac{2 d^2}{3}=\frac{4}{3} \Rightarrow|d|=\sqrt{2}
$
Hence, the answer is the option 4.
4. General Term of Binomial Expansion
Question: A possible value of $x^{\prime}$, for which the ninth term in the expansion of $\left\{3^{\log _3 \sqrt{25^{x-1}+7}}+3\left(-\frac{1}{8}\right) \log _3\left(5^{x-1}+1\right)\right\}^{10}$ in the increasing powers of $3\left(-\frac{1}{8}\right) \log _3\left(5^{x-1}+1\right)$ is equal to 180 , is
(1) 0
(2) -1
(3) 2
(4) 1
Answer:
$\begin{aligned} & 3^{\log _3\left(\sqrt{25^{x-1}}+7\right)}=\sqrt{25^{x-1}+7} \text { and } \\ & 3^{-\frac{1}{8} \log _3\left(5^{x-1}+1\right)}=\left(5^{x-1}+1\right)^{-\frac{1}{8}} \\ & \text { Now } T_9=T_8+1=10 C_8 \cdot\left(\sqrt{25^{x-1}+7}\right)^2\left(5^{x-1}+1\right)^{-\frac{1}{8} \cdot 8} \\ & \Rightarrow 10 C_8 \cdot\left(25^{x-1}+7\right)\left(5^{x-1}+1\right)^{-1}=180 \\ & \quad \Rightarrow \frac{25^{x-1}+7}{5^{x-1}+1}=4 \\ & \quad \Rightarrow \operatorname{Let}^x-1 \\ & \quad \Rightarrow \frac{t^2+7}{t+1}=4 \\ & \quad \Rightarrow t^2-4 t+3=0 \\ & \Rightarrow 5^{x-1}=1, t=5^{\circ} \cdot 5^x-1=3 \\ & \Rightarrow x-1=0, x-1=\log _5 3 \\ & \Rightarrow x=1, x=1+\log _5 3\end{aligned}$
Hence, the answer is the option 4.
5. Cramer’s law
Question: If the system of linear equations $2 x-3 y=\gamma+5$ and $\alpha \mathrm{x}+5 \mathrm{y}=\beta+1$, where $\alpha, \beta, \gamma \in R$ has infinitely many solutions, then the value of $|9 \alpha+3 \beta+5 \gamma|$ is equal to $\_\_\_\_$ .
(1) 58
(2) 72
(3) 86
(4) 67
Answer:
$
\begin{aligned}
& 2 x-3 y=\gamma+5 \\
& \alpha x+5 y=\beta+1
\end{aligned}
$
For infinite solutions, these two lines should coincide
$
\begin{aligned}
& \frac{2}{\alpha}=\frac{-3}{5}=\frac{\gamma+5}{\beta+1} \\
& \Rightarrow \frac{2}{\alpha}=-\frac{3}{5} \Rightarrow \alpha=-\frac{10}{3} \text { and } \\
& \frac{\gamma+5}{\beta+1}=\frac{-3}{5} \\
& \Rightarrow 5 \gamma+25=-3 \beta-3 \\
& \Rightarrow 3 \beta+5 \gamma=-28 \\
& \therefore|9 \alpha+3 \beta+5 \gamma|=|-30-28|=58
\end{aligned}
$
Hence, the answer is the option (1)
6. Vector (or Cross) Product of Two Vectors
Question: Let $\vec{a}=\hat{i}+\hat{j}+\hat{k}, \vec{b}$ and $\vec{c}=\hat{j}-\hat{k}$ be three vectors such that $\vec{a} \times \vec{b}=\vec{c}$ and $\vec{a} \cdot \vec{b}=1$ If the length of the projection vector of the vector $\vec{b}$ on the vector $\vec{a} \times \vec{c}$ is $l$, then the value of $3 l^2$ is equal to $\_\_\_\_$ .
(1) 2
(2) 4
(3) 6
(4) 8
Answer:
Projection of $\vec{b}$ on $(\vec{a} \times \vec{c})=\frac{|b(\vec{a} \times \vec{c})|}{\mid \vec{a} \times \vec{d}}=l$ $\_\_\_\_$
Now $\vec{a} \times \vec{b}=\vec{c}$
$
\begin{aligned}
& \vec{c} \cdot(\vec{a} \times \vec{b})=\vec{c} \cdot \vec{c}=|\vec{c}|^2 \\
& \Rightarrow[\vec{c} \vec{a} \vec{b}]=(\sqrt{2})^2=2 \\
& \Rightarrow[\vec{b} \vec{a} \vec{c}]=-2 \\
& \Rightarrow|\vec{b} \cdot(\vec{a} \times \vec{c})|=2
\end{aligned}
$
Also $\vec{a} \times \vec{c}=\left|\begin{array}{ccc}i & j & k \\ 1 & 1 \\ 0 & 1 & -1\end{array}\right|$
$
\begin{aligned}
& =i(-1-1)-j(-1)+k(1) \\
& =-2 i+j+k \\
& |\vec{a} \times \vec{c}|=\sqrt{4+1+1}=\sqrt{6}
\end{aligned}
$
From (i)
$
\begin{aligned}
& l=\frac{2}{\sqrt{6}} \\
& \Rightarrow 3 l^2=3 \cdot \frac{4}{6} \\
& =2
\end{aligned}
$
Hence, the answer is the option (1).
7. Maxima and Minima of a Function
Question: Let the maximum area of the triangle that can be inscribed in the ellipse $\frac{x^2}{a^2}+\frac{y^2}{4}=1, a>2$, having one of its vertices at one end of the major axis of the ellipse and one of its sides parallel to the $y$-axis, be $6 \sqrt{3}$. Then the eccentricity of the ellipse is:
(1) $\frac{\sqrt{3}}{2}$
(2) $\frac{1}{2}$
(3) $\frac{1}{\sqrt{2}}$
(4) $\frac{\sqrt{3}}{4}$
Answer:

Area of $\triangle \mathrm{ABC}=\frac{1}{2} \times 4 \sin \theta \times \mathrm{a}(1-\cos \theta)$
(A)
for the maximum area,
$
\begin{gathered}
\frac{\mathrm{dA}}{\mathrm{~d} \theta}=0 \\
2 \mathrm{a} \cos \theta(1-\cos \theta)+2 \mathrm{a} \sin \theta(\sin \theta)=0 \\
2 \mathrm{a}\left(\sin ^2 \theta-\cos ^2 \theta+\cos \theta\right)=0 \\
2 \mathrm{a}\left(\sin ^2 \theta-\cos ^2 \theta+\cos \theta\right)=0 \\
-2 \cos ^2 \theta+\cos \theta+1=0 \\
\cos \theta=1, \cos \theta=-\frac{1}{2} \\
\theta=0 \theta=\frac{2 \pi}{3}
\end{gathered}
$
(not possible)
$
\begin{aligned}
\frac{\mathrm{d}^2 \mathrm{~A}}{\mathrm{~d} \theta^2} & =2 \mathrm{a}(4 \sin \theta \cos \theta-\sin \theta) \\
\theta & =\frac{2 \pi}{3} ; \frac{\mathrm{d}^2 \mathrm{~A}}{\mathrm{~d} \theta^2}=\text { negative }
\end{aligned}
$
Hence at $\theta=\frac{2 \pi}{3}$, Area is maximum
$
\begin{aligned}
& \text { maximum Area }=\frac{1}{2} \times 4 \times \frac{\sqrt{3}}{2} \times a\left(1+\frac{1}{2}\right)=6 \sqrt{3} \\
& \begin{array}{l}
a \sqrt{3}\left(\frac{3}{2}\right)=6 \sqrt{3} \\
a=4
\end{array} \\
& \therefore b^2=a^2\left(1-e^2\right) \\
& 4=16\left(1-e^2\right)
\end{aligned}
$
$e=\frac{\sqrt{3}}{2}$
Hence, the answer is the option (1)
8. Shortest Distance between Two Lines
Question: If the lines $\frac{x-2}{1}=\frac{y-3}{1}=\frac{z-4}{-k}$ and $\frac{x-1}{k}=\frac{y-4}{2}=\frac{z-5}{1}$ are coplanar, then k can have:
(1) exactly three values
(2) any value
(3) exactly one value
(4) exactly two values
Answer:
For coplanar lines we have
$
\begin{aligned}
& \left|\begin{array}{cc}
1-1-1 \\
1-\frac{1}{2}-k & 1
\end{array}\right|=0 \\
& 1(1+2 k)+1\left(1+k^2\right)-1(2-k)=0 \\
& 2 k+1+k^2+1-2+k=0 \\
& k^2+3 k=0 \\
& \mathrm{k}=0,-3
\end{aligned}
$
We have two values.
Hence, the answer is the option (4).
9. Application Of Inequality In Definite Integration
Question: If $l=\int_1^2 \frac{d x}{\sqrt{2 x^2-9 x^2+12 x+4}}$ then:
(1) $\frac{1}{6}<l^2<\frac{1}{2}$
(2) $\frac{1}{8}<I^2<\frac{1}{4}$
(3) $\frac{1}{9}<l^2<\frac{1}{8}$
(4) $\frac{1}{16}<I^2<\frac{1}{9}$
Answer:
$\begin{aligned} & f(x)=\frac{1}{\sqrt{2 x^3-9 x^2+12 x+4}} \\ & f^{\prime}(x)=\frac{-1 \quad\left(6 x^2-18 x+12\right)}{\left(2 x^3-9 x^2+12 x+4\right)^{\frac{3}{2}}} \\ & =\frac{-6(x-1)(x-2)}{2\left(2 x^3-9 x^2+12 x+4\right)^{\frac{3}{2}}} \\ & f(1)=\frac{1}{3} f(2)=\frac{1}{\sqrt{8}} \\ & \frac{1}{3}<I<\frac{1}{\sqrt{8}}\end{aligned}$
Hence, the answer is the option (3).
10. Multiplication of two matrices
Question: If $p=\left[\begin{array}{c}\frac{\sqrt{3}}{2} \frac{1}{2} \\ -\frac{1}{2} \frac{\sqrt{3}}{2}\end{array}\right], \mathrm{A}=[11]$ and $\mathrm{Q}=\mathrm{PAP}^{\top}$, then $\mathrm{P}^{\top} \mathrm{Q}^{2015} \mathrm{P}$ is:
(1) $\left[\begin{array}{c}0 & 2015 \\ 0 & 0\end{array}\right]$
(2) $\left[\begin{array}{cc}2015 & 1 \\ 0 & 1\end{array}\right]$
(3) $\left[\begin{array}{ccc}2015 & 0 \\ 1 & 2015\end{array}\right]$
(4) $\left[\begin{array}{c}1 & 2015 \\0 & 1\end{array}\right]$
Answer:
$\begin{gathered}P^T Q^{2015} P \\ =P^T Q \cdot Q \cdot Q \cdot Q \cdot Q \ldots \ldots \ldots Q P \\ 2015 \mathrm{times} \\ \text { Now, if } P=\left[\begin{array}{l}\sqrt{3} / 2 \\ -1 / 2 \sqrt{3} / 2\end{array}\right] \\ \text { so, } P^T P=\left[\begin{array}{r}\sqrt{3} / 2-1 / 2 \\ 1 / 2 \sqrt{3} / 2\end{array}\right] \cdot\left[\begin{array}{l}\sqrt{3} / 2 \\ -1 / 2 \sqrt{3} / 2\end{array}\right] \\ {\left[\begin{array}{l}101 \\ 01\end{array}\right]=I} \\ \rightarrow P^T Q^{2015}=A^{2015} \\ =\left[\begin{array}{ll}11 & \\ 01 & \cdot[11]\end{array} \ldots[01]\right. \\ {\left[\begin{array}{l}1 & 2015 \\ 0 & 1\end{array}\right]}\end{gathered}$
Hence, the correct answer is option (4).
We can say that we have a clear understanding of topics to prioritize and which ones have made it to the most repeated maths topics for JEE Mains. Now, lets strategize from a broader perspective and see the most important chapters for JEE mains maths 2026.