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OpenStudy (anonymous):
Verify the identity. cos (x - y) - cos (x + y) = 2 sin x sin y
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OpenStudy (anonymous):
@satellite73
OpenStudy (anonymous):
@nincompoop
OpenStudy (anonymous):
|dw:1439356759779:dw|
OpenStudy (anonymous):
thanks!
OpenStudy (anonymous):
yw
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