### Related

##### cos-trigsimp

eq1:cos(3*Pi/2-arcsin...

trigsimp(eq1);

Calculate

##### cos-trigsimp

trigsimp({1-[cos(x)]/...

Calculate

##### cos-trigsimp

trigsimp(2+2*cos(x));

Calculate

##### cos-trigsimp

cos (x+y), trigsimp;

Calculate

##### cos-trigsimp

trigsimp(cos(x)-1/cos...

Calculate

##### cos-trigsimp

trigsimp(cos(x)-1/cos...

Calculate

##### cos-trigsimp

trigsimp((1-(cos(x))/...

Calculate

##### cos-trigsimp

trigsimp((A+cos(w*t))...

Calculate

##### cos-trigsimp

trigsimp(1+cos(2*x));

Calculate

##### cos-trigsimp

trigsimp((A+cos(w*t))...

Calculate

### [cos,trigsimp]

Run Example
```(%i1)trigsimp((cos(a)*cos(b)*cos(c)*cos(d) + cos(a)*cos(e)*cos(c)*cos(f) + cos(b)*cos(d)));
(%o1) cos(a) cos(c) cos(e) cos(f) + (cos(a) cos(b) cos(c) + cos(b)) cos(d)
(%i2) ```
Run Example
```trigsimp(cos(pi/4));
pi
(%o1)                               cos(--)
4
(%i2) ```
Run Example
```trigsimp(cos(pi/2));
pi
(%o1)                               cos(--)
2
(%i2) ```

### Related Help

Help for Cos

Help for Trigsimp