![cosxcosy=\frac{1}{2}\left[cos(x+y)+cos(x-y)\right]\\\\R=\frac{1}{2}\left(cosxcosy-sinxsiny+cosxcosy-sinxsiny\right)\\\\=\frac{1}{2}\cdot2cosxcosy=cosxcosy=L\\\\R=L](/tpl/images/0175/9726/71e8d.png)
Review important identitie
cosx cosy = 1/2 [cos(x+y) + cos(x−y)]...
Mathematics, 18.08.2019 11:50 ayoismeisalex
Review important identitie
cosx cosy = 1/2 [cos(x+y) + cos(x−y)]
Answers: 1
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