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### Related

##### changevar-integrate

integrate(e^x/(1-e^2*...

changevar(%,t=e^x,t,x);

Calculate

##### changevar-cos-integrate

az1: 'integrate(x^3*c...

changevar(az1,x-2*t,x...

Calculate

##### changevar-cos-integrate-sin

i = 'integrate(1/sin(...

eq:t=cos(x);

changevar(%o1, eq, t,...

Calculate

##### changevar-cos-integrate-logabs-sin-true

logabs:true;

i = 'integrate(1/sin(...

eq:t=cos(x);

Calculate

##### changevar-integrate

integrate(e^x/(1-e^2*...

changevar(%,t=e^x,t,e...

Calculate

##### changevar-diff-integrate-ratsimp

integrate(x/(x^3+1),x);

ratsimp (diff(integra...

a:integrate(1/((x-3)^...

Calculate

##### changevar-cos-erf-integrate-nouns-phi-pi-sin

kerf(x):=(sin(theta)/...

I:'integrate(kerf(x),...

I:changevar(I,y-sin(t...

Calculate

##### changevar-expand-factor-intosum-lhs-part-ratsubst-rhs-sumcontract

A_xm[t]:=(Mwi_x[t]-Mw...

eq:A_xm[t]=Cwi[t]/Dwi...

f1:changevar(rhs(eq),...

Calculate

##### changevar-integrate

integrate(e^x/(1-e^2*...

changevar(%,t=e^x,t);

Calculate

##### changevar-integrate

integrate(e^x/(1-e^2*...

changevar(%,t);

Calculate

### changevar

Run Example
```(%i1)assume;
(%o1)                               assume
(%i2)  'integrate (e^x/(e^(2*x)+25),x);
/     x
[    e
(%o2)                           I --------- dx
]  2 x
/ e    + 25
(%i3) changevar(%,z-((e^x)+25),z,x);
(%o3)             ev(%,nouns);
```
Run Example
```'integrate((x+(x^2+1)^(1/2))^(-n),x,1,+inf);
inf
/
[             1
(%o1)                     I    ------------------- dx
]           2          n
/    (sqrt(x  + 1) + x)
1
(%i2) changevar(%,y-(sqrt(x^2+1)+x),y,x);
(%o2)             ```
Run Example
```integrate(x/(x^3+1),x);
2 x - 1
2            atan(-------)
log(x  - x + 1)        sqrt(3)    log(x + 1)
(%o1)            --------------- + ------------- - ----------
6             sqrt(3)          3
(%i2) ratsimp (diff(integrate(x/(x^3+1),x),x));
x
(%o2)                               ------
3
x  + 1
(%i3) integrate(1/((x-3)^4+1/2),x);
/
[      1
(%o3)                          I ------------ dx
]        4   1
/ (x - 3)  + -
2
(%i4) changevar(%,x-3-y,y,x);
(%o4)             (%i5) ```

### Related Help

Help for Changevar