1.

The value of (sin2 7 1/2° + cos2 7 1/2°) -(sin2 30° +cos2 30°) + (sin2 7° + sin2 83°) is equal to:(A) 3 (B) 3 1/2 (C) 2 (D) 1

Answer»

Correct option  (D) 1  

Explanation:

sin 83° = cos 7°

∴ the given expression is 1 – 1 + 1 = 1.



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