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  • Given that sinα = 1 by 2and cosβ =1 by 2 , then the value of (α + β) is (A) 0° (B) 30° (C) 60° (D) 90°

Given that sinα =1/2 and cosβ =1/2 , then the value of (α + β) is

(A) 0°              (B) 30°            (C) 60°            (D) 90°

Answers (1)

Answer.      [D]      
Solution.   

\\\sin \alpha=1/2\Rightarrow \alpha=30^0\\\cos \beta=1/2\Rightarrow \beta=60^0\\\therefore \alpha+\beta=90^0
Hence option (D) is correct.

 

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infoexpert27

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