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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):
I can't really figure out what identities to use
OpenStudy (anonymous):
Cos(x - y) = Cos(x)*Cos(y) + Sin(x)*Sin(y) Cos(x + y) = Cos(x)*Cos(y) - Sin(x)*Sin(y)
OpenStudy (anonymous):
ah I see! I figured it out! thank you!
OpenStudy (anonymous):
npz
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