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Limit Using Expansion - Practice Questions & MCQ

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main

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  • 109 Questions around this concept.

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\mathrm{ \lim _{x \rightarrow \infty}\left(1+\frac{3}{x}+\frac{5}{x^2}\right)^x \text { equals }}

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\mathrm{\lim _{n \rightarrow \infty} \prod_{r=2}^n\left(\frac{r^3+1}{r^3-1}\right)} is
 

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\mathrm{\lim _{x \rightarrow 0} \frac{3 e^x-x^3-3 x-3}{\tan ^2 x}}

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Find  \mathrm{\lim _{x \rightarrow 0} \frac{(1+x)^{1 / m}-(1-x)^{1 / m}}{(1+x)^{1 / n}-(1-x)^{1 / n}}}

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The value of \mathrm{f(0)}  so that the fanction \mathrm{f(x)= \frac{\sqrt{1+x}-\sqrt[3]{1+x}}{x}} becomes continuous is equal to

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The integer \mathrm{n} for which \mathrm{\lim _{x \rightarrow 0}\left\{\frac{(\cos x-1)\left(\cos x-e^2\right)}{x^n}\right\}} is a finite, non-zero real number, is

 

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Evaluate \mathrm{\lim _{x \rightarrow 0} \frac{\mathrm{e}^{\mathrm{x}}-\mathrm{e}^{-x}-2 x}{\sin ^3 x}}

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\mathrm{f(x)} is the integral of \mathrm{\frac{2 \sin x-\sin 2 x}{x^3}, x \neq 0, find \lim _{x \rightarrow 0} f^{\prime}(x)}.

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\mathrm{\lim _{n \rightarrow \infty} \cos \left[\pi \sqrt{\left(n^2+n\right)}\right] \text { when } n \text { is an integer, is equal to: } }

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The integer \mathrm{ n} for which  \mathrm{\lim _{x \rightarrow 0} \frac{(\cos x-1)\left(\cos x-e^x\right)}{x^n}} is a finite non-zero number is:

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Concepts Covered - 2

Limit Using Expansion (Part 1)

Limit Using Expansion (Part 1)

Using the expansions is one of the methods to find the limits. The following expansion formulas which is also known as Taylor series, are very useful in evaluating various limits.

 \\\text { (i) } \quad e^{x}=1+x+\frac{x^{2}}{2 !}+\frac{x^{3}}{3 !}+\ldots \ldots\\\\\text { (ii) } \quad a^{x}=1+x\left(\log _{e} a\right)+\frac{x^{2}}{2 !}\left(\log _{e} a\right)^{2}+\frac{x^{3}}{3 !}\left(\log _{e} a\right)^{3}+\ldots \ldots \ldots\\\\ \text { (iii) } \quad \log (1+x)=x-\frac{x^{2}}{2}+\frac{x^{3}}{3}-\frac{x^{4}}{4}+\ldots \ldots \ldots\\\\\text { (iv) } \quad \log (1-x)=-x-\frac{x^{2}}{2}-\frac{x^{3}}{3}-\frac{x^{4}}{4}-\ldots \ldots \ldots\\\\\text{ (v) } \quad(1+x)^{n}=1+n x+\frac{n(n-1)}{2 !} x^{2}+\frac{n(n-1)(n-2)}{3 !} x^{3}+\ldots \ldots \ldots

Limit Using Expansion (Part 2)

Limit Using Expansion (Part 2)

\\\text { (vi) } \quad \sin x=x-\frac{x^{3}}{3 !}+\frac{x^{5}}{5 !}-\ldots \ldots .\\\\\text { (vii) } \quad \cos x=1-\frac{x^{2}}{2 !}+\frac{x^{4}}{4 !}-\ldots \ldots .\\\\\text { (viii) } \quad \tan x=x+\frac{x^{3}}{3}+\frac{2}{15} x^{5}+\ldots \ldots .\\\\\text { (ix) } \quad \sin ^{-1} x=x+\frac{1^{2} }{3 !}\cdot x^{3}+\frac{1^{2} \cdot 3^{2} }{5 !}\cdot x^{5}+\frac{1^{2} \cdot 3^{2} \cdot 5^{2} }{7 !} \cdot x^{7}\ldots \ldots \ldots\\\\\text { (x) } \quad \tan ^{-1} x=x-\frac{x^{3}}{3}+\frac{x^{5}}{5}+\ldots \ldots \ldots

Study it with Videos

Limit Using Expansion (Part 1)
Limit Using Expansion (Part 2)

Study other Related Concepts

Limit Using Expansion Current Topic

Limit
Left-Hand Limits and Right-Hand Limits
Algebra of Limits
Limit of Indeterminate Form and Algebraic limit
Limit of Algebraic function
Limit Using Expansion
Sandwich Theorem
Limits of Trigonometric Functions
Exponential and Logarithmic Limits
Limits of the form (1 power infinity)

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Books

Reference Books

Limit Using Expansion (Part 1)

Mathematics for Joint Entrance Examination JEE (Advanced) : Calculus

Page No. : 2.15

Line : 22

Limit Using Expansion (Part 2)

Mathematics for Joint Entrance Examination JEE (Advanced) : Calculus

Page No. : 2.15

Line : 30

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