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1) sin2A/cos^2A-sin^2A
2) cos2A+sin^2A
3) cos36*+sin^2(18*)/cos^2(18*)
1) sin2A/cos^2A-sin^2A
2) cos2A+sin^2A
3) cos36*+sin^2(18*)/cos^2(18*)
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2) cos2α+sin²α=cos²α-sin²α+sin²α=cos²α
3)