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OpenStudy (anonymous):
cos A = 5/13 Find the following: cos 2A, cos 4A, tan 2A, sin (A/2)
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OpenStudy (anonymous):
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OpenStudy (anonymous):
cos2A=2(cosA)^2-1 cosA=5/13
OpenStudy (anonymous):
cos2A=2*(5/13)^2-1
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