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Question: Transform cos^k(x)'s to cos(kx)'s

Question:Transform cos^k(x)'s to cos(kx)'s

acarchau 25 Maple
trig trigonometric-identities
May 13 2024
2

I have a sum in powers of  cosines : a0 + a1 cos(x) + a2 cos^2(x) + a3 cos^3(x) + ... + ak cos^k(x) . I want to transform it into a sum of the form : b0 + b1 cos(x) + b2 cos(2x)+  ... bk cos(kx). How can I do this in Maple?
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