Q. 154.3( 4 Votes )

# If cos (α + β) si

Answer :

Given,

cos (α + β) sin (γ + δ) = cos (α - β) sin (γ – δ) Adding 1 both sides:  Now, Subtracting 1 both sides:  Dividing equation (i) by equation (ii):        {sin (-A) = -sin A & cos (-A) = cos A}  cot α cot β cot γ = cot δ

Hence Proved

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