Updates:
Status: Fixed
Comment #3 on issue 1590 by [email protected]: Reduce powers of sin's and
cos's to multi-argument functions
http://code.google.com/p/sympy/issues/detail?id=1590
TR8 will handle either since a power is a special case of a product
FU['TR8'](cos(x)**2)
cos(2*x)/2 + 1/2
FU['TR8'](sin(x)**2)
-cos(2*x)/2 + 1/2
TR7 is only meant to target cos
FU['TR7'](sin(x)**2)
sin(x)**2
FU['TR7'](cos(x)**2)
cos(2*x)/2 + 1/2
But applying TR5 first will convert the sin to cos so TR7 will work
FU['TR7'](FU['TR5'](sin(x)**2))
-cos(2*x)/2 + 1/2
No single transform is written to reverse this, but trigsimp (or fu) will
do so:
eq
-cos(2*x)/2 + 1/2
fu(eq)
sin(x)**2
trigsimp(eq)
sin(x)**2
cos(2*x)/2+S.Half
cos(2*x)/2 + 1/2
fu(_)
cos(x)**2
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