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if sin θ+12sin2θ=m cosθ  এবং sinθ-12sin 2θ=n cosθ হলে m2-n2=?

if sin θ+12sin2θ=m cosθ  এবং sinθ-12sin 2θ=n cosθ হলে m2-n2=? Correct Answer 4√mn

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