6.23.15 Transforming sin(x) into cos(x)*tan(x): sin2costan

The sin2costan command replaces sin(x) by cos(x)tan(x) in an expression.

• sin2costan takes one argument:
  expr, an expression containing trigonometric functions.
• sin2costan(expr) returns expr with anything of the form sin(x) replaced by cos(x)tan(x).

Example.
Input:

Output: