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If x=tcost ,y=t+sint . Then (d^2 x)/(dy...

If `x=tcost ,y=t+sint ` . Then `(d^2 x)/(dy^2)`at `t=pi/2` is
(a)`(pi+4)/2` (b) `-(pi+4)/2` (c)`-2` (d) none of these

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