10.2.25 Simplifying and expressing preferentially with tangents
The trigtan command rewrites
trigonometric expressions into expressions where as many trigonometric
functions as possible are written in terms of tangents, using the identities
sin(x)2+cos(x)2=1, tan(x)=sin(x)/cos(x).
- trigtan takes
expr, an expression containing trigonometric functions.
- trigtan(expr) returns expr
with the trigonometric functions written as much as possible in
terms of tangents.
Example
| trigtan(sin(x)^4+cos(x)^2+1) |
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| | 2 tan 4x+3 tan 2x+2 |
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| tan 4x+2 tan 2x+1 |
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