A Sinθ=1+cos2θ
B Sin2θ=1-cos2θ
C Sin2θ-cos2θ =1
D Sinθ=1/cosθ
Correct Answer: Option B
ত্রিকোণমিতিতে, Sin2θ+cos2θ =1
বা, Sin2θ =1-cos2θ
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