![\bf \textit{Sum to Product Identities} \\\\ cos(\alpha)+cos(\beta)=2cos\left(\cfrac{\alpha+\beta}{2}\right)cos\left(\cfrac{\alpha-\beta}{2}\right) \\\\\\ cos(\alpha)-cos(\beta)=-2sin\left(\cfrac{\alpha+\beta}{2}\right)sin\left(\cfrac{\alpha-\beta}{2}\right) \\\\[-0.35em] \rule{34em}{0.25pt}](/tpl/images/0053/3624/11552.png)
Cos4theta+cos2theta/ cos4theta-cos2theta=
-cot3θcotθ
-2cot3θcotθ
cot6θcot2θ
...
Mathematics, 05.07.2019 08:10 sbender2901
Cos4theta+cos2theta/ cos4theta-cos2theta=
-cot3θcotθ
-2cot3θcotθ
cot6θcot2θ
-1
Answers: 3
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