# Simplifying: simplify

### 5.23.5 Simplifying: simplify

The simplify command simplifies expressions. As with all automatic simplifications, do not expect miracles; you will have to use specific rewriting rules if it does not work.

- simplify takes one argument:
  expr, an expression.
- simplify(expr) returns the simplified version of expr.

#### Example.

Input:

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

Output:

2 cos | ⎛ ⎝ | 2 x | ⎞ ⎠

Warning.
simplify is more efficient in radian mode (which you can turn on, if it isn’t already, by checking radian in the cas configuration or inputting angle_radian:=1, see Section 2.5.3).