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OpenStudy (anonymous):
I really, really need help with two trigonometric identities. Is anyone particularly good at trig?
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OpenStudy (anonymous):
Ask the question.
OpenStudy (anonymous):
cos4(x) = cos^4(x) - 6sin^2(x) cos^2(x) + sin^4(x) sec^2(x) = 2sec(x) / sec(x) + 1
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