Q10 of 120 Page 89

If sin α = and cos β =, then the value of (∝ + β) is

Given: sin α = 1/2 and cos β = 1/2

sin α = 1/2 = sin 30° and cos β = 1/2 = cos 60°


Comparing each sine and cosine angles respectively, we get


α = 30° and β = 60°


Thus, α +β = 30°+60° = 90°

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