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If x = 2cost − cos2t and y = 2sint − sin2t, then the value of d^2y/dx^2 at t = π/2 is

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If x = 2cost − cos2t and y = 2sint − sin2t, then the value of d2y/dx2 at t = π/2 is

(A) 3/2 

(B) −5/2 

(C) 5/2 

(D) −3/2 

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Answer is (D) −3/2

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