abbyhoward9302
18.08.2019 •
Mathematics
Review important identitie
cosx cosy = 1/2 [cos(x+y) + cos(x−y)]
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Ответ:
cos(x-y) = cosxcosy + sinxsiny;
=> cos(x+y) + cos(x-y) = 2cosxcosy =>cosx cosy = 1/2 [cos(x+y) + cos(x−y)];
Ответ:
Ответ:
The second one
Step-by-step explanation: