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Verified answer
1-cos2a/sin2a=sin2a/1+cos2a(1-cos2a)(1+cos2a)=(sin2a)(sin2a)
1-cos2a+cos2a-cos²2a=sin²2a
1-cos²2a=sin²2a
sin²2a+cos²2a=1
Identitas Trigonometri = sin²a+cos²a=1
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