9.2.23 Simplifying and expressing preferentially with sines
Any trigonometric function can be written in terms of sins and
coss, and with the identity sin(x)2+cos(x)2=1, the even
powers of cos can be turned into powers of sin. 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 sin and
cos, with as many coss as possible transformed to sins.
Example
trigsin(sin(x)^4+cos(x)^2+1) |