10.2.23 Simplifying and expressing preferentially with sines
Any trigonometric function can be written in terms of sines and
cosines, and even powers of cosines can be turned into powers of sines by
using the identity sin(x)2+cos(x)2=1. The
trigsin command performs
these substitutions.
-
trigsin takes
expr, an expression containing trigonometric functions.
- trigsin(expr) returns expr
with the trigonometric functions rewritten in terms of sines and
cosines, with as many cosines as possible transformed to sines.
Example
| trigsin(sin(x)^4+cos(x)^2+1) |