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OpenStudy (anonymous):
2cos(3x)
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OpenStudy (mathmale):
Hello, and welcome to Open Study! Please, would you include the instructions that came with this problem? Suggestions: Hold that "2." Determine a way to write cos 3x in terms of cos x and sin x only. Hint: Use the sum formula for the cosine function: cos (x+y) = cos x cos y - sin x sin y.
OpenStudy (anonymous):
Are you allowed to use a calculator?
OpenStudy (anonymous):
Thank, I found the answer already. Sorry for the incomplete of the question. Actually it is a part of answer from a differentiation, then I need to use trigonometry to solve it. I just want to know the 2cos(3x)= ?? to continue my calculation. Whatever, thank you all.
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