Substitution to Transform Integral Form (Show Transformed Expression)
The question provides a specific substitution and asks the student to show or identify the resulting transformed integral without necessarily evaluating it to a final numerical answer.
We recall that $\Gamma ( y ) = e ^ { - y } y ^ { y } \int _ { - 1 } ^ { + \infty } e ^ { - y \phi ( s ) } d s$ where $\phi ( s ) = s - \ln(1+s)$, and that $\phi_-^{-1} : ]0,+\infty[ \to ]-1,0[$ and $\phi_+^{-1} : ]0,+\infty[ \to ]0,+\infty[$ are the inverse bijections of the restrictions of $\phi$. Show that $$\Gamma ( y ) = e ^ { - y } y ^ { y } \int _ { 0 } ^ { \infty } e ^ { - y q } \left( \left( \phi _ { + } ^ { - 1 } \right) ^ { \prime } ( q ) - \left( \phi _ { - } ^ { - 1 } \right) ^ { \prime } ( q ) \right) d q$$
The integral $\int \left( 1 + x - \frac { 1 } { x } \right) e ^ { x + \frac { 1 } { x } } d x$, is equal to (1) $( x + 1 ) e ^ { x + \frac { 1 } { x } } + c$ (2) $- x e ^ { x + \frac { 1 } { x } } + c$ (3) $( x - 1 ) e ^ { x + \frac { 1 } { x } } + c$ (4) $x e ^ { x + \frac { 1 } { x } } + c$
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) $\frac { 2 m \left( x ^ { 5 m } + x ^ { 4 m } \right) } { \left( x ^ { 2 m } + x ^ { m } + 1 \right) ^ { 2 } }$
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) $- 12 \ln | 1 - x | + 3 x + C$
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 (where $C$ is a constant of integration) (1) $12 \log _ { e } | 1 - x | - 3 x + c$ (2) $- 12 \log _ { e } | 1 - x | - 3 x + c$ (3) $- 12 \log _ { e } | 1 - x | + 3 x + c$ (4) $12 \log _ { e } | 1 - x | + 3 x + c$
The integral $\int \frac { e ^ { 3 \log _ { e } 2 x } + 5 e ^ { 2 \log _ { e } 2 x } } { e ^ { 4 \log _ { e } x } + 5 e ^ { 3 \log _ { e } x } - 7 e ^ { 2 \log _ { e } x } } d x , x > 0$, is equal to (where $c$ is a constant of integration) (1) $\log _ { \mathrm { e } } \left| x ^ { 2 } + 5 x - 7 \right| + \mathrm { c }$ (2) $4 \log _ { \mathrm { e } } \left| x ^ { 2 } + 5 x - 7 \right| + \mathrm { c }$ (3) $\frac { 1 } { 4 } \log _ { \mathrm { e } } \left| x ^ { 2 } + 5 x - 7 \right| + \mathrm { c }$ (4) $\log _ { e } \sqrt { x ^ { 2 } + 5 x - 7 } + c$
If $\int \frac { 1 } { \sqrt [ 5 ] { ( x - 1 ) ^ { 4 } ( x + 3 ) ^ { 6 } } } \mathrm {~d} x = \mathrm { A } \left( \frac { \alpha x - 1 } { \beta x + 3 } \right) ^ { B } + \mathrm { C }$, where C is the constant of integration, then the value of $\alpha + \beta + 20 \mathrm { AB }$ is $\_\_\_\_$
If $\int \frac{2x^{2} + 5x + 9}{\sqrt{x^{2} + x + 1}} \, \mathrm{d}x = x\sqrt{x^{2} + x + 1} + \alpha\sqrt{x^{2} + x + 1} + \beta \log_{e}\left| x + \frac{1}{2} + \sqrt{x^{2} + x + 1} \right| + \mathrm{C}$, where $C$ is the constant of integration, then $\alpha + 2\beta$ is equal to $\_\_\_\_$.