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OpenStudy (anonymous):
prove the following identities: a) 4[sin^6(x)+cos^6(x)] = 4-3sin^2(2x) b) tan^2[(x/2)+(pi/4) = (1+sinx)/(1-sinx)
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OpenStudy (anonymous):
Letter a : https://answers.yahoo.com/question/index?qid=20091026151917AAOg84i
OpenStudy (anonymous):
thanks! :)
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