# Prove that:  Multiply and divide by , we get But 2sin A cos A = sin 2A

Then the above equation becomes, Multiply and divide by 2, we get But 2sin A cos A = sin 2A

Then the above equation becomes, Multiply and divide by 2, we get But 2sin A cos A = sin 2A

Then the above equation becomes, Multiply and divide by 2, we get But 2sin A cos B = sin (A+B) +sin(A–B), so the above equation becomes,    Multiply and divide by , we get But 2sin A cos A = sin 2A

Then the above equation becomes, Multiply and divide by 2, we get But 2sin A cos A = sin 2A

Then the above equation becomes,      Hence proved

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