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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

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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`
A. `2+4 sin alpha`
B. `2-4sin alpha`
C. 2
D. none of these
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Correct Answer - C
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