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OpenStudy (steve816):
Is this true? cos(xy) = cos(x)*cos(y) Is there a trigonometric identity for cos(xy)?
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OpenStudy (agent0smith):
I'm not aware of one. cos(xy) = cos(x)*cos(y) is false, eg. for x=0, y=pi/2.
OpenStudy (steve816):
Alright, thanks for clearing things up.
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