Q. 165.0( 3 Votes )

# If y sin <span la

Answer :

Given, y sin ϕ = x sin (2θ + ϕ) Adding 1 both sides:  Now, Adding 1 both sides:  Dividing equation (i) by equation (ii):        {sin (-A) = -sin A & cos (-A) = cos A} (x + y) cot (θ + ϕ) = (y -x) cot θ

Hence Proved

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