Integration by Substitution

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Let $f : [ 1 , \infty ) \rightarrow \mathbb { R }$ be a differentiable function such that $f ( 1 ) = \frac { 1 } { 3 }$ and $3 \int _ { 1 } ^ { x } f ( t ) d t = x f ( x ) - \frac { x ^ { 3 } } { 3 } , x \in [ 1 , \infty )$. Let $e$ denote the base of the natural logarithm. Then the value of $f ( e )$ is
(A) $\frac { e ^ { 2 } + 4 } { 3 }$
(B) $\frac { \log _ { e } 4 + e } { 3 }$
(C) $\frac { 4 e ^ { 2 } } { 3 }$
(D) $\frac { e ^ { 2 } - 4 } { 3 }$
If
$$\alpha = \int _ { \frac { 1 } { 2 } } ^ { 2 } \frac { \tan ^ { - 1 } x } { 2 x ^ { 2 } - 3 x + 2 } d x$$
then the value of $\sqrt { 7 } \tan \left( \frac { 2 \alpha \sqrt { 7 } } { \pi } \right)$ is $\_\_\_\_$. (Here, the inverse trigonometric function $\tan ^ { - 1 } x$ assumes values in $\left( - \frac { \pi } { 2 } , \frac { \pi } { 2 } \right)$.)
$\int \frac { d x } { \cos x + \sqrt { 3 } \sin x }$ equals
(1) $\frac { 1 } { 2 } \log \tan \left( \frac { x } { 2 } + \frac { \pi } { 12 } \right) + c$
(2) $\frac { 1 } { 2 } \log \tan \left( \frac { x } { 2 } - \frac { \pi } { 12 } \right) + c$
(3) $\log \tan \left( \frac { x } { 2 } + \frac { \pi } { 12 } \right) + c$
(4) $\log \tan \left( \frac { x } { 2 } - \frac { \pi } { 12 } \right) + c$
If $m$ is a non-zero number and $\int \frac { x ^ { 5 m - 1 } + 2 x ^ { 4 m - 1 } } { \left( x ^ { 2 m } + x ^ { m } + 1 \right) ^ { 3 } } d x = f ( x ) + c$, then $f ( x )$ is equal to
(1) $\frac { \left( x ^ { 5 m } - x ^ { 4 m } \right) } { 2 m \left( x ^ { 2 m } + x ^ { m } + 1 \right) ^ { 2 } }$
(2) $\frac { 1 } { 2 m } \frac { x ^ { 4 m } } { \left( x ^ { 2 m } + x ^ { m } + 1 \right) ^ { 2 } }$
(3) $\frac { x ^ { 5 m } } { 2 m \left( x ^ { 2 m } + x ^ { m } + 1 \right) ^ { 2 } }$
(4) $\frac { 2 m \left( x ^ { 5 m } + x ^ { 4 m } \right) } { \left( x ^ { 2 m } + x ^ { m } + 1 \right) ^ { 2 } }$
The integral $\int _ { 0 } ^ { \frac { 1 } { 2 } } \frac { \ln ( 1 + 2 x ) } { 1 + 4 x ^ { 2 } } d x$ equals
(1) $\frac { \pi } { 4 } \ln 2$
(2) $\frac { \pi } { 16 } \ln 2$
(3) $\frac { \pi } { 8 } \ln 2$
(4) $\frac { \pi } { 32 } \ln 2$
Let, the function $F$ be defined as $F ( x ) = \int _ { 1 } ^ { x } \frac { e ^ { t } } { t } d t , x > 0$, then the value of the integral $\int _ { 1 } ^ { x } \frac { e ^ { t } } { t + a } d t$, where $a > 0$, is
(1) $e ^ { a } [ F ( x ) - F ( 1 + a ) ]$
(2) $e ^ { - a } [ F ( x + a ) - F ( a ) ]$
(3) $e ^ { a } [ F ( x + a ) - F ( 1 + a ) ]$
(4) $e ^ { - a } [ F ( x + a ) - F ( 1 + a ) ]$
The integral $\int \frac{dx}{x^2(x^4+1)^{3/4}}$ equals:
(1) $-\left(1 + \frac{1}{x^4}\right)^{1/4} + C$
(2) $-\left(\frac{x^4+1}{x^4}\right)^{1/4} + C$
(3) $\left(\frac{x^4+1}{x^4}\right)^{1/4} + C$
(4) $\left(1 + \frac{1}{x^4}\right)^{1/4} + C$
The integral $\int \frac { d x } { x ^ { 2 } \left( x ^ { 4 } + 1 \right) ^ { \frac { 3 } { 4 } } }$ equals to
(1) $- \left( \frac { x ^ { 4 } + 1 } { x ^ { 4 } } \right) ^ { \frac { 1 } { 4 } } + c$
(2) $\left( \frac { x ^ { 4 } + 1 } { x ^ { 4 } } \right) ^ { \frac { 1 } { 4 } } + c$
(3) $\left( x ^ { 4 } + 1 \right) ^ { \frac { 1 } { 4 } } + c$
(4) $- \left( x ^ { 4 } + 1 \right) ^ { \frac { 1 } { 4 } } + c$
The integral $\int \frac{2x^{12} + 5x^9}{(x^5 + x^3 + 1)^3} dx$ is equal to: (1) $\frac{-x^{10}}{2(x^5+x^3+1)^2} + C$ (2) $\frac{x^{10}}{2(x^5+x^3+1)^2} + C$ (3) $\frac{-x^5}{(x^5+x^3+1)^2} + C$ (4) $\frac{x^5}{2(x^5+x^3+1)^2} + C$
The integral $\int \frac { d x } { ( 1 + \sqrt { x } ) \sqrt { x - x ^ { 2 } } }$ is equal to
(1) $- 2 \sqrt { \frac { 1 + \sqrt { x } } { 1 - \sqrt { x } } } + c$
(2) $- \sqrt { \frac { 1 - \sqrt { x } } { 1 + \sqrt { x } } } + c$
(3) $- 2 \sqrt { \frac { 1 - \sqrt { x } } { 1 + \sqrt { x } } } + c$
(4) $\sqrt { \frac { 1 + \sqrt { x } } { 1 - \sqrt { x } } } + c$
The integral $\int \frac{2x^{12} + 5x^9}{(x^5 + x^3 + 1)^3} dx$ is equal to:
(1) $\frac{-x^{10}}{2(x^5 + x^3 + 1)^2} + C$
(2) $\frac{x^{10}}{2(x^5 + x^3 + 1)^2} + C$
(3) $\frac{-x^5}{(x^5 + x^3 + 1)^2} + C$
(4) $\frac{x^5}{2(x^5 + x^3 + 1)^2} + C$
If $m$ is a non-zero number and $\int \frac{x^{5m-1} + 2x^{4m-1}}{(x^{2m} + x^m + 1)^3} dx = f(x) + C$, then $f(x)$ is:
(1) $\frac{x^{5m}}{2m(x^{2m} + x^m + 1)^2}$
(2) $\frac{x^{4m}}{2m(x^{2m} + x^m + 1)^2}$
(3) $\frac{(2x^{2m} + x^m)}{(x^{2m} + x^m + 1)^2}$
(4) $\frac{(x^{5m} + x^{4m})}{2m(x^{2m} + x^m + 1)^2}$
The integral $\int \frac { 2 x ^ { 3 } - 1 } { x ^ { 4 } + x } d x$ is equal to (here $C$ is a constant of integration)
(1) $\frac { 1 } { 2 } \ln \frac { | x ^ { 3 } + 1 | } { x ^ { 2 } } + C$
(2) $\frac { 1 } { 2 } \ln \frac { ( x ^ { 3 } + 1 ) ^ { 2 } } { | x ^ { 3 } | } + C$
(3) $\ln \frac { | x ^ { 3 } + 1 | } { x ^ { 2 } } + C$
(4) $\ln \frac { | x ^ { 3 } + 1 | } { x ^ { 3 } } + C$
The integral $\int \frac { \sin ^ { 2 } x \cos ^ { 2 } x } { \left( \sin ^ { 5 } x + \cos ^ { 3 } x \sin ^ { 2 } x + \sin ^ { 3 } x \cos ^ { 2 } x + \cos ^ { 5 } x \right) ^ { 2 } } d x$, is equal to (where $C$ is the constant of integration).
(1) $\frac { - 1 } { 1 + \cot ^ { 3 } x } + C$
(2) $\frac { 1 } { 3 \left( 1 + \tan ^ { 3 } x \right) } + C$
(3) $\frac { - 1 } { 3 \left( 1 + \tan ^ { 3 } x \right) } + C$
(4) $\frac { 1 } { 1 + \cot ^ { 3 } x } + C$
If $f \left( \frac { x - 4 } { x + 2 } \right) = 2 x + 1 , ( x \in R - \{ 1 , - 2 \} )$, then $\int f ( x ) d x$ is equal to
(1) $12 \ln | 1 - x | - 3 x + C$
(2) $- 12 \ln | 1 - x | - 3 x + C$
(3) $12 \ln | 1 - x | + 3 x + C$
(4) $- 12 \ln | 1 - x | + 3 x + C$
The integral $\int \frac { 3 x ^ { 13 } + 2 x ^ { 11 } } { \left( 2 x ^ { 4 } + 3 x ^ { 2 } + 1 \right) ^ { 4 } } d x$, is equal to
(1) $\frac { x ^ { 4 } } { 6 \left( 2 x ^ { 4 } + 3 x ^ { 2 } + 1 \right) ^ { 3 } } + C$
(2) $\frac { x ^ { 4 } } { \left( 2 x ^ { 4 } + 3 x ^ { 2 } + 1 \right) ^ { 3 } } + C$
(3) $\frac { x ^ { 12 } } { \left( 2 x ^ { 4 } + 3 x ^ { 2 } + 1 \right) ^ { 3 } } + C$
(4) $\frac { x ^ { 12 } } { 6 \left( 2 x ^ { 4 } + 3 x ^ { 2 } + 1 \right) ^ { 3 } } + C$
Let, $n \geq 2$ be a natural number and $0 < \theta < \frac { \pi } { 2 }$. Then $\int \frac { \left( \sin ^ { n } \theta - \sin \theta \right) ^ { \frac { 1 } { n } } \cos \theta } { \sin ^ { n + 1 } \theta } d \theta$, is equal to
(1) $\frac { n } { n ^ { 2 } - 1 } \left( 1 - \frac { 1 } { \sin ^ { n + 1 } \theta } \right) ^ { \frac { n + 1 } { n } } + c$
(2) $\frac { n } { n ^ { 2 } + 1 } \left( 1 - \frac { 1 } { \sin ^ { n - 1 } \theta } \right) ^ { \frac { n + 1 } { n } } + c$
(3) $\frac { n } { n ^ { 2 } - 1 } \left( 1 - \frac { 1 } { \sin ^ { n - 1 } \theta } \right) ^ { \frac { n + 1 } { n } } + c$
(4) $\frac { n } { n ^ { 2 } - 1 } \left( 1 + \frac { 1 } { \sin ^ { n - 1 } \theta } \right) ^ { \frac { n + 1 } { n } } + c$
$\int \sec ^ { 2 } x \cdot \cot ^ { \frac { 4 } { 3 } } x \, d x$ is equal to
(1) $3 \tan ^ { - \frac { 1 } { 3 } } x + C$
(2) $- \frac { 3 } { 4 } \tan ^ { - \frac { 4 } { 3 } } x + C$
(3) $- 3 \tan ^ { - \frac { 1 } { 3 } } x + C$
(4) $- 3 \cot ^ { - \frac { 1 } { 3 } } x + C$
If $f(x) = \int \frac{\left(5x^8 + 7x^6\right)}{\left(x^2 + 1 + 2x^7\right)^2}\,dx,\,(x \geq 0)$, and $f(0) = 0$, then the value of $f(1)$ is
(1) $\frac{-1}{4}$
(2) $\frac{1}{2}$
(3) $\frac{1}{4}$
(4) $-\frac{1}{2}$
If $\int \frac { d x } { x ^ { 3 } \left( 1 + x ^ { 6} \right) ^ { \frac { 2 } { 3 } } } = x f ( x ) \left( 1 + x ^ { 6} \right)^{ \frac { 1 } { 3 } } + C$, where $C$ is a constant of integration, then the function $f ( x )$ is equal to
(1) $\frac { 3 } { x ^ { 2 } }$
(2) $- \frac { 1 } { 2 x ^ { 3 } }$
(3) $- \frac { 1 } { 6 x ^ { 3 } }$
(4) $- \frac { 1 } { 2 x ^ { 2 } }$
If $f : R \rightarrow R$ is a differentiable function and $f ( 2 ) = 6$, then $\lim _ { x \rightarrow 2 } \int _ { 6 } ^ { f ( x ) } \frac { 2 t d t } { ( x - 2 ) }$ is:
(1) 0
(2) $2 f ^ { \prime } ( 2 )$
(3) $24 f ^ { \prime } ( 2 )$
(4) $12 f ^ { \prime } ( 2 )$
The integral $\int \frac { d x } { ( x + 4 ) ^ { \frac { 8 } { 7 } } ( x - 3 ) ^ { \frac { 6 } { 7 } } }$ is equal to: (where $C$ is a constant of integration)
(1) $\left( \frac { x - 3 } { x + 4 } \right) ^ { \frac { 1 } { 7 } } + C$
(2) $\left( \frac { x - 3 } { x + 4 } \right) ^ { \frac { - 1 } { 7 } } + C$
(3) $\frac { 1 } { 2 } \left( \frac { x - 3 } { x + 4 } \right) ^ { \frac { 3 } { 7 } } + C$
(4) $- \frac { 1 } { 13 } \left( \frac { x - 3 } { x + 4 } \right) ^ { \frac { - 13 } { 7 } } + C$
If $\int \frac { d \theta } { \cos ^ { 2 } \theta ( \tan 2 \theta + \sec 2 \theta ) } = \lambda \tan \theta + 2 \log _ { e } | f ( \theta ) | + C$ where $C$ is a constant of integration, then the ordered pair $( \lambda , f ( \theta ) )$ is equal to:
(1) $( 1,1 - \tan \theta )$
(2) $( - 1,1 - \tan \theta )$
(3) $( - 1,1 + \tan \theta )$
(4) $( 1,1 + \tan \theta )$
If $\int \frac{\cos\theta}{5 + 7\sin\theta - 2\cos^2\theta}\,d\theta = A\log_e|B(\theta)| + C$, where $C$ is a constant of integration, then $\frac{B(\theta)}{A}$ can be:
(1) $\frac{2\sin\theta+1}{\sin\theta+3}$
(2) $\frac{2\sin\theta+1}{5(\sin\theta+3)}$
(3) $\frac{5(\sin\theta+3)}{2\sin\theta+1}$
(4) $\frac{5(2\sin\theta+1)}{\sin\theta+3}$
The value of the integral $\int \frac { \sin \theta \cdot \sin 2 \theta \left( \sin ^ { 6 } \theta + \sin ^ { 4 } \theta + \sin ^ { 2 } \theta \right) \sqrt { 2 \sin ^ { 4 } \theta + 3 \sin ^ { 2 } \theta + 6 } } { 1 - \cos 2 \theta } d \theta$ is (where $c$ is a constant of integration)
(1) $\frac { 1 } { 18 } \left[ 11 - 18 \sin ^ { 2 } \theta + 9 \sin ^ { 4 } \theta - 2 \sin ^ { 6 } \theta \right] ^ { \frac { 3 } { 2 } } + c$
(2) $\frac { 1 } { 18 } \left[ 9 - 2 \sin ^ { 6 } \theta - 3 \sin ^ { 4 } \theta - 6 \sin ^ { 2 } \theta \right] ^ { \frac { 3 } { 2 } } + c$
(3) $\frac { 1 } { 18 } \left[ 11 - 18 \cos ^ { 2 } \theta + 9 \cos ^ { 4 } \theta - 2 \cos ^ { 6 } \theta \right] ^ { \frac { 3 } { 2 } } + c$
(4) $\frac { 1 } { 18 } \left[ 9 - 2 \cos ^ { 6 } \theta - 3 \cos ^ { 4 } \theta - 6 \cos ^ { 2 } \theta \right] ^ { - \frac { 3 } { 2 } } + c$