![\bf \textit{Product to Sum Identities} \\\\ cos(\alpha)cos(\beta)=\cfrac{1}{2}\left[\cfrac{}{}cos(\alpha-\beta)\quad +\quad cos(\alpha+\beta)\right] \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ cos(a)cos(B)=\cfrac{1}{2}\left[\cfrac{}{}cos(a-B)+cos(a-B) \right] \\\\\\ 2cos(a)cos(B)=cos(a-B)+cos(a-B)](/tpl/images/0331/9940/f11b0.png)
Ireally need some !
cos(a - b) + cos(a + b) =
a. 0
b. 2cosacosb
c. 2sinas...
Mathematics, 18.10.2019 18:30 nanett0226
Ireally need some !
cos(a - b) + cos(a + b) =
a. 0
b. 2cosacosb
c. 2sinasinb
d. 2(cosacosb + sinasinb)
Answers: 1
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