MathGroup Archive 2002

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TrigExpand


Using Mathematica 4.1, what's going on with Trig Expand?

TrigExpand[Cos[x]^2]
returns
Cos[x]^2

But
TrigExpand[y+Cos[x]^2]
returns
1/2 + y + Cos[x]^2/2 - Sin[x]^2/2

Why doesn't it just leave the argument alone and return
y+Cos[x]^2 ?





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