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using the formulas for lowering powers to rewrite the expression in terms of first power of cosine cos(x)^7 ..can anyone help me with this?
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Cos^2(x) = (1+Cos(2x)) /2
Cos^7(x) = Cos(x) * [(1+Cos(2x)) /2] ^3 then expand and further simplify terms
how do you expand it?
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