Answer :
i. We know, 2 sin A cos B = sin (A + B) + sin (A – B)
{sin (-x) = - sin x}
{sin (180° - x) = sin x}
Hence Proved
ii. We know, 2 sin A cos B = sin (A + B) + sin (A – B)
Take L.H.S
{sin (-x) = - sin x}
= R.H.S.
Hence Proved
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