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OpenStudy (anonymous):
if Sin[2x]=2Sin[x]Cox[x] then if 10*Cos[Sqrt[5]x] + [20/Sqrt[5]]*Sin[Sqrt[5]x] Subbing 10=K*Sin[Z] && [20/Sqrt[5]]=K*Cos[Z] What will it be in the simplest form? I have worked this out BUT I would like to confirm my results please!!
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