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OpenStudy (anonymous):
solve the eq.- cosA-sin3A=cos2A
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OpenStudy (anonymous):
expand cos2A and sin3A
OpenStudy (dumbcow):
use trig identities to get everything in terms of cosA
OpenStudy (dumbcow):
cos(2A) = 2cos^2 - 1 , sin(2A) = 2sin(A)cos(A) sin(3A) = sin(2A+A) = sin(2A)cos(A) + sin(A)cos(2A)
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