1.

If cos−1x−cos−1y2=α where −1≤x≤1, −2≤y≤2, x≤y2, then for all x,y, 4x2−4xycosα+y2 is equal to :

Answer»

If cos1xcos1y2=α where 1x1, 2y2, xy2, then for all x,y, 4x24xycosα+y2 is equal to :



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