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ololo11 [35]
3 years ago
5

Rewrite with only sin x and cos x. cos 2x + sin x

Mathematics
1 answer:
Natasha_Volkova [10]3 years ago
8 0

we can pretty much use any of the 3 double-angle identities for cosine, so


\bf \textit{Double Angle Identities} \\\\ cos(2\theta)= \begin{cases} cos^2(\theta)-sin^2(\theta)\\ 1-2sin^2(\theta)\\ 2cos^2(\theta)-1&\leftarrow \textit{let's use this one} \end{cases}\\\\ -------------------------------\\\\ cos(2x)+sin(x)\implies 2cos^2(x)-1+sin(x)

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