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If pi lt alpha lt (3pi)/2then the expres...

If `pi lt alpha lt (3pi)/2`then the expression `sqrt(4 sin^4alpha +sin^2 2alpha)+4cos^2(pi/4-alpha/2)` is equal to (A)` 2 +4sinalpha` (B) `2-4cosalpha` (C) 2 (D)` 2-4sinalpha`

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