6.23.16  Transforming cos(x) into sin(x)/tan(x): cos2sintan

The cos2sintan command replaces cos(x) by sin(x)/tan(x) in an expression.

• cos2sintan takes one argument:
  expr, an expression containing trigonometric functions.
• cos2sintan(expr) returns expr with anything of the form cos(x) replaced by sin(x)/tan(x).

Example.
Input:

Output: