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in Mathematics by (21.8k points)

If cos–1 x – cos –1  y/2  = α, where -1 ≤  x  ≤ 1, -2 ≤ 2, x ≤ y/2 , then for all x, y, 4x2 - 4xy cosα + y2 is equal to :

(1)  4 sin2 α

(2)  2 sin2 α 

(3)  4 sinα – 2x2 y2 

(4)   4 cos2α + 2x2 y2 

1 Answer

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Best answer

Correct option  (1)  4 sin2 α

Explanation:

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