How we can solve this (cos …
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Ram Kushwah 7 years ago
LHS = cos2 x + cos2 y + 2 cos x cos y + sin2 x + sin2y + 2 sin x sin y
= 2 + 2 ( cos x cos y + sin x siny )
= 2 ( 1 + cos ( x - y ) )
= 2 * 2 cos2( ( x - y ) / 2 ) (because 1.+ cos x=2cos2x / 2 )
= 4 cos2 ( (x - y ) / 2 ) = RHS
2Thank You