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OpenStudy (anonymous):
pleeeeeeease help :( please i'll give you a medal!! which double angle or half angle identity would you use to verify that 1+cos2a=2/1+tan^2a? a. tan2a=2tan a/1-tan^2a b. tan a/2= +- square root (whole problem) 1-cos a/ 1+cos a c. cos2a= cos^2a- sin^2a d. cos2a=2cos^2a-1
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