### 5.21.5 Simplify : simplify

simplify simplifies the expression.

As with all automatic simplifications, do not expect miracles,
you will have to use specific rewriting rules if it does not work.

Input :

simplify((sin(3*x)+sin(7*x))/sin(5*x))

Output :

4*(cos(x))`^`

2-2

Warning simplify is more efficient in radian mode (check
radian in the cas configuration
or input angle_radian:=1).