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x=t cost, y=t+sin t. Then (d^2 x)/(dy^2)...

`x=t cost, y=t+sin t.` Then `(d^2 x)/(dy^2)` at `t=pi/2` is

A

` (pi+4)/2`

B

` - (pi +4)/2`

C

64

D

128

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The correct Answer is:
B
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