Answer :


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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