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OpenStudy (anonymous):
cosx cosy=1/2(sin(x+y)+sin(x-y)) true or false
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OpenStudy (raden):
the identity of cosx cosy = 1/2 [ cos(x+y) + cos(x-y) ]
OpenStudy (raden):
so, true or false :)
OpenStudy (anonymous):
false? lol
OpenStudy (raden):
hehe, yes...
OpenStudy (anonymous):
lol okay thank you so much
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OpenStudy (raden):
welcome :)
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