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    Maxima and Minima in Calculus - Practice Questions & MCQ

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

    Quick Facts

    • Maxima and Minima of a Function is considered one the most difficult concept.

    • 85 Questions around this concept.

    Solve by difficulty

    If m and M are the minimum and the maximum values of

    4+\frac{1}{2}\sin ^{2}2x-2\cos ^{4}x\, ,x\, \epsilon \, R,

     then Mm is equal to :

     

     

    The maximum volume (in cu.m) of the right circular cone having a slant height of 3 m is:

    Let the tangents drawn to the circle, $x^2+y^2=16$ from the point $P(0, h)$ meet the $x$ axis at points A and B. If the area of $\triangle A P B$ is minimum, then n is equal to :

     If x= -1 and x = 2 are extreme points of  f\left ( x \right )= \alpha \log \left | x \right |+\beta x^{2} +x then 

    Let a,b,\epsilon R  be such that the function f given by f(x)=ln \left | x \right |+bx^{2}+ax,x\neq 0

    has extreme values at x = –1 and x =  2.

    Statement 1: f has a local maximum at x = –1 and at x = 2.

    Statement 2 : a= \frac{1}{2} \: and\: b=\frac{-1}{4}.

    A wire of length 2 units is cut into two parts which are bent respectively to form a square of side=x units and a circle of radius=r units.  If the sum of the areas of the square and the circle so formed is minimum, then :

    Which of the following graphs represents local maximaa at x = a

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    The function $f(x)=2 x+3(x)^{\frac{2}{3}}, x \in \mathbb{R}$, has

    $\mathrm{f\left ( x \right )= x^{3}-3x+4}$ has local minimum at

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    Which is the correct for the following figure 

    Concepts Covered - 1

    Maxima and Minima of a Function

    Maxima and Minima of a Function

    Let $y=f(x)$ be a real function defined at $x=a$. Then the function $f(x)$ is said to have a maximum value at $x=a$ if $f(x) \leq f(a) \quad \forall a \in R$.
    And also the function $f(x)$ is said to have a minimum value at $x=a$, if $f(x) \geq f(a) \quad \forall a \in R$

       

    Concept of Local Maxima and Local Minima 

    The function $f(x)$ is said to have local maxima (or maxima) at a point 'a' if the value of $f(x)$ at ' $a$ ' is greater than its values for all $x$ in a small neighbourhood of ' $a$ '. In other words, $f(x)$ has a maxima at $x=$ ' $a$ ', if $f(a+h) \leq f(a)$ and $f(a-h) \leq f(a)$, where $h>0$ (very small quantity).

    The function $f(x)$ is said to have local minima (or minima) at a point 'b' if the value of $f(x)$ at 'b' is less than its values for all $x$ in a small neighbourhood of 'b'. In other words, $f(x)$ has a maximum at $x=$ 'b', if $f(b+h) \geq f(b)$ and $f(b-h) \geq f(b)$, where $h>0$ (very small quantity).

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    Reference Books

    Maxima and Minima of a Function

    Mathematics for Joint Entrance Examination JEE (Advanced) : Calculus

    Page No. : 6.15

    Line : 13

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