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Prove That cos⁡θ2sin⁡θ2=sin⁡θ2\cos \frac{\theta}{2} \sin \frac{\theta}{2}=\frac{\sin \theta}{2}

Question 74

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Prove that cos⁡θ2sin⁡θ2=sin⁡θ2\cos \frac{\theta}{2} \sin \frac{\theta}{2}=\frac{\sin \theta}{2} .

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