Indefinite & Definite Integrals

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jee-main 2023 Q81 Piecewise/Periodic Function Integration
Let $[ \mathrm { x } ]$ denote the greatest integer $\leq \mathrm { x }$. Consider the function $\mathrm { f } ( \mathrm { x } ) = \max \left\{ \mathrm { x } ^ { 2 } , 1 + [ x ] \right\}$. Then the value of the integral $\int _ { 0 } ^ { 2 } f ( x ) d x$ is :
(1) $\frac { 5 + 4 \sqrt { 2 } } { 3 }$
(2) $\frac { 8 + 4 \sqrt { 2 } } { 3 }$
(3) $\frac { 1 + 5 \sqrt { 2 } } { 3 }$
(4) $\frac { 4 + 5 \sqrt { 2 } } { 3 }$
jee-main 2023 Q81 Piecewise/Periodic Function Integration
If $\int _ { - 0.15 } ^ { 0.15 } \left| 100 x ^ { 2 } - 1 \right| d x = \frac { k } { 3000 }$, then $k$ is equal to $\_\_\_\_$ .
jee-main 2023 Q82 Maximizing or Optimizing a Definite Integral
The minimum value of the function $f ( x ) = \int _ { 0 } ^ { 2 } e ^ { | x - t | } d t$ is
(1) $2 ( e - 1 )$
(2) $2 e - 1$
(3) 2
(4) $e ( e - 1 )$
jee-main 2023 Q82 Piecewise/Periodic Function Integration
Let $[ t ]$ denote the greatest integer $\leq t$. Then $\frac { 2 } { \pi } \int _ { \frac { \pi } { 6 } } ^ { \frac { 5 \pi } { 6 } } ( 8 [ \operatorname { cosec } x ] - 5 [ \cot x ] ) d x$ is equal to $\_\_\_\_$
jee-main 2024 Q67 Accumulation Function Analysis
$\lim _ { x \rightarrow \frac { \pi } { 2 } } \left( \frac { 1 } { \left( x - \frac { \pi } { 2 } \right) ^ { 2 } } \int _ { x ^ { 3 } } ^ { \left( \frac { \pi } { 2 } \right) ^ { 3 } } \cos \left( \frac { 1 } { t ^ { 3 } } \right) d t \right)$ is equal to
(1) $\frac { 3 \pi } { 8 }$
(2) $\frac { 3 \pi ^ { 2 } } { 4 }$
(3) $\frac { 3 \pi ^ { 2 } } { 8 }$
(4) $\frac { 3 \pi } { 4 }$
jee-main 2024 Q67 Accumulation Function Analysis
$\lim _ { x \rightarrow \frac { \pi } { 2 } } \left( \frac { \int _ { x ^ { 3 } } ^ { ( \pi / 2 ) ^ { 3 } } \left( \sin \left( 2 t ^ { 1 / 3 } \right) + \cos \left( t ^ { 1 / 3 } \right) \right) d t } { \left( x - \frac { \pi } { 2 } \right) ^ { 2 } } \right)$ is equal to
(1) $\frac { 5 \pi ^ { 2 } } { 9 }$
(2) $\frac { 9 \pi ^ { 2 } } { 8 }$
(3) $\frac { 11 \pi ^ { 2 } } { 10 }$
(4) $\frac { 3 \pi ^ { 2 } } { 2 }$
jee-main 2024 Q68 Finding a Function from an Integral Equation
Let $f : \left[ - \frac { \pi } { 2 } , \frac { \pi } { 2 } \right] \rightarrow R$ be a differentiable function such that $f ( 0 ) = \frac { 1 } { 2 }$, If $\lim _ { x \rightarrow 0 } \frac { x \int _ { 0 } ^ { x } f ( t ) d t } { e ^ { x ^ { 2 } } - 1 } = \alpha$, then $8 \alpha ^ { 2 }$ is equal to :
(1) 16
(2) 2
(3) 1
(4) 4
jee-main 2024 Q68 Accumulation Function Analysis
Let $f ( x ) = \int _ { 0 } ^ { x } \left( t + \sin \left( 1 - e ^ { t } \right) \right) d t , x \in \mathbb { R }$. Then, $\lim _ { x \rightarrow 0 } \frac { f ( x ) } { x ^ { 3 } }$ is equal to
(1) $- \frac { 1 } { 6 }$
(2) $\frac { 2 } { 3 }$
(3) $- \frac { 2 } { 3 }$
(4) $\frac { 1 } { 6 }$
jee-main 2024 Q71 Definite Integral Evaluation (Computational)
Let $f: R \rightarrow R$ be a function defined $f(x) = \frac{x}{(1 + x^4)^{1/4}}$ and $g(x) = f(f(f(f(x))))$, then $18\int_0^{\sqrt{2\sqrt{5}}} x^2 g(x)\, dx$
(1) 33
(2) 36
(3) 42
(4) 39
jee-main 2024 Q71 Definite Integral Evaluation (Computational)
The integral $\int _ { 1 / 4 } ^ { 3 / 4 } \cos \left( 2 \cot ^ { - 1 } \sqrt { \frac { 1 - x } { 1 + x } } \right) d x$ is equal to
(1) $1 / 2$
(2) $- 1 / 2$
(3) $- 1 / 4$
(4) $1 / 4$
jee-main 2024 Q72 Definite Integral Evaluation (Computational)
Let $a$ and $b$ be real constants such that the function $f$ defined by $$f(x) = \begin{cases} x^2 + 3x + a, & x \leq 1 \\ bx + 2, & x > 1 \end{cases}$$ be differentiable on $R$. Then, the value of $\int_{-2}^{2} f(x)\, dx$ equals
(1) $\frac{15}{6}$
(2) $\frac{19}{6}$
(3) 21
(4) 17
jee-main 2024 Q74 Integral Equation with Symmetry or Substitution
The value of $\int_0^1 (2x^3 - 3x^2 - x + 1)^{\frac{1}{3}} dx$ is equal to:
(1) 0
(2) 1
(3) 2
(4) $-1$
jee-main 2024 Q74 Definite Integral as a Limit of Riemann Sums
The value of $\lim _ { n \rightarrow \infty } \sum _ { k = 1 } ^ { n } \frac { n ^ { 3 } } { \left( n ^ { 2 } + k ^ { 2 } \right) \left( n ^ { 2 } + 3 k ^ { 2 } \right) }$ is :
(1) $\frac { ( 2 \sqrt { 3 } + 3 ) \pi } { 24 }$
(2) $\frac { 13 \pi } { 8 ( 4 \sqrt { 3 } + 3 ) }$
(3) $\frac { 13 ( 2 \sqrt { 3 } - 3 ) \pi } { 8 }$
(4) $\frac { ( 2 \sqrt { 3 } - 3 ) \pi } { 24 }$
jee-main 2024 Q74 Integral Equation with Symmetry or Substitution
If the value of the integral $\int _ { - \frac { \pi } { 2 } } ^ { \frac { \pi } { 2 } } \left( \frac { x ^ { 2 } \cos x } { 1 + \pi ^ { x } } + \frac { 1 + \sin ^ { 2 } x } { 1 + e ^ { ( \sin x ) ^ { 2023 } } } \right) d x = \frac { \pi } { 4 } ( \pi + a ) - 2$, then the value of $a$ is
(1) 3
(2) $- \frac { 3 } { 2 }$
(3) 2
(4) $\frac { 3 } { 2 }$
jee-main 2024 Q74 Definite Integral Evaluation (Computational)
Let $\beta ( \mathrm { m } , \mathrm { n } ) = \int _ { 0 } ^ { 1 } x ^ { \mathrm { m } - 1 } ( 1 - x ) ^ { \mathrm { n } - 1 } \mathrm {~d} x , \mathrm {~m} , \mathrm { n } > 0$. If $\int _ { 0 } ^ { 1 } \left( 1 - x ^ { 10 } \right) ^ { 20 } \mathrm {~d} x = \mathrm { a } \times \beta ( \mathrm { b } , \mathrm { c } )$, then $100 ( \mathrm { a } + \mathrm { b } + \mathrm { c } )$ equals
(1) 1021
(2) 2120
(3) 2012
(4) 1120
jee-main 2024 Q74 Integral Inequalities and Limit of Integral Sequences
The value of $k \in \mathrm {~N}$ for which the integral $I _ { n } = \int _ { 0 } ^ { 1 } \left( 1 - x ^ { k } \right) ^ { n } d x , n \in \mathbb { N }$, satisfies $147 I _ { 20 } = 148 I _ { 21 }$ is
(1) 14
(2) 8
(3) 10
(4) 7
jee-main 2024 Q75 Definite Integral Evaluation (Computational)
If $\int_0^{\frac{\pi}{3}} \cos^4 x \, dx = a\pi + b\sqrt{3}$, where $a$ and $b$ are rational numbers, then $9a + 8b$ is equal to:
(1) 2
(2) 1
(3) 3
(4) $\frac{3}{2}$
jee-main 2024 Q75 Definite Integral Evaluation (Computational)
$\int _ { 0 } ^ { \pi / 4 } \frac { \cos ^ { 2 } x \sin ^ { 2 } x } { \left( \cos ^ { 3 } x + \sin ^ { 3 } x \right) ^ { 2 } } d x$ is equal to
(1) $1 / 6$
(2) $1 / 3$
(3) $1 / 12$
(4) $1 / 9$
jee-main 2024 Q75 Definite Integral Evaluation (Computational)
If $\int _ { 0 } ^ { 1 } \frac { 1 } { \sqrt { 3 + x } + \sqrt { 1 + x } } d x = a + b \sqrt { 2 } + c \sqrt { 3 }$, where $a , b , c$ are rational numbers, then $2 a + 3 b - 4 c$ is equal to:
(1) 4
(2) 10
(3) 7
(4) 8
jee-main 2024 Q75 Definite Integral Evaluation (Computational)
For $0 < \mathrm { a } < 1$, the value of the integral $\int _ { 0 } ^ { \pi } \frac { d x } { 1 - 2 a \cos x + a ^ { 2 } }$ is :
(1) $\frac { \pi ^ { 2 } } { \pi + a ^ { 2 } }$
(2) $\frac { \pi ^ { 2 } } { \pi - a ^ { 2 } }$
(3) $\frac { \pi } { 1 - a ^ { 2 } }$
(4) $\frac { \pi } { 1 + a ^ { 2 } }$
jee-main 2024 Q75 Maximizing or Optimizing a Definite Integral
If the value of the integral $\int _ { - 1 } ^ { 1 } \frac { \cos \alpha x } { 1 + 3 ^ { x } } d x$ is $\frac { 2 } { \pi }$. Then, a value of $\alpha$ is
(1) $\frac { \pi } { 3 }$
(2) $\frac { \pi } { 6 }$
(3) $\frac { \pi } { 4 }$
(4) $\frac { \pi } { 2 }$
jee-main 2024 Q75 Definite Integral Evaluation (Computational)
The value of the integral $\int _ { - 1 } ^ { 2 } \log _ { e } \left( x + \sqrt { x ^ { 2 } + 1 } \right) d x$ is
(1) $\sqrt { 5 } - \sqrt { 2 } + \log _ { e } \left( \frac { 7 + 4 \sqrt { 5 } } { 1 + \sqrt { 2 } } \right)$
(2) $\sqrt { 5 } - \sqrt { 2 } + \log _ { e } \left( \frac { 9 + 4 \sqrt { 5 } } { 1 + \sqrt { 2 } } \right)$
(3) $\sqrt { 2 } - \sqrt { 5 } + \log _ { e } \left( \frac { 7 + 4 \sqrt { 5 } } { 1 + \sqrt { 2 } } \right)$
(4) $\sqrt { 2 } - \sqrt { 5 } + \log _ { e } \left( \frac { 9 + 4 \sqrt { 5 } } { 1 + \sqrt { 2 } } \right)$
jee-main 2024 Q87 Integral Equation with Symmetry or Substitution
Let $\mathrm { fx } = \int _ { 0 } ^ { \mathrm { x } } \mathrm { gt } \log _ { \mathrm { e } } \frac { 1 - \mathrm { t } } { 1 + \mathrm { t } } \mathrm { dt }$, where g is a continuous odd function. If $\int _ { - \frac { \pi } { 2 } } ^ { \frac { \pi } { 2 } } \mathrm { fx } + \frac { \mathrm { x } ^ { 2 } \cos \mathrm { x } } { 1 + \mathrm { e } ^ { \mathrm { x } } } \mathrm { dx } = \frac { \pi ^ { 2 } } { \alpha } - \alpha$, then $\alpha$ is equal to $\_\_\_\_$.
jee-main 2024 Q87 Piecewise/Periodic Function Integration
Let $[ t ]$ denote the largest integer less than or equal to $t$. If $$\int _ { 0 } ^ { 3 } \left( \left[ x ^ { 2 } \right] + \left[ \frac { x ^ { 2 } } { 2 } \right] \right) \mathrm { d } x = \mathrm { a } + \mathrm { b } \sqrt { 2 } - \sqrt { 3 } - \sqrt { 5 } + \mathrm { c } \sqrt { 6 } - \sqrt { 7 }$$ where $\mathrm { a } , \mathrm { b } , \mathrm { c } \in \mathbf { Z }$, then $\mathrm { a } + \mathrm { b } + \mathrm { c }$ is equal to $\_\_\_\_$
jee-main 2025 Q1 Accumulation Function Analysis
Let $f ( x ) = \int _ { 0 } ^ { x } t \left( t ^ { 2 } - 9 t + 20 \right) d t , 1 \leq x \leq 5$. If the range of $f$ is $[ \alpha , \beta ]$, then $4 ( \alpha + \beta )$ equals:
(1) 253
(2) 154
(3) 125
(4) 157