1.

Given sin α = 1/2 and cos β = 1/2, then  value of (α + β) is :(A) 0°(B) 30°(C) 60°(D) 90° 

Answer»

Answer is (D) 90°

Given,
sin α = 1/2

⇒ sin α = sin 30°

α =30°

and cos β = 1/2

⇒ cos β = cos 60°

β = 60°

Now, α + β = 30° + 60° = 90°



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