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OpenStudy (anonymous):
I have a trouble in trigonomerty. Can you help me with this problem cos(square) a + sin(square) a = cos 2a
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sam (.sam.):
Proving problem?
sam (.sam.):
\[\cos^2(a) + \sin^2(a) = \cos (2a)\]?
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
no, typo thats not square, but 4
sam (.sam.):
\[\cos^4(a) + \sin^4(a) = \cos (2a) \]?
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OpenStudy (anonymous):
yeah, that's right can you solve that?
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