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

`x=tcost ,y=t+sintdot` Then `(d^(2x))/(dy^2)a tt=pi/2` is `(pi+4)/2` (b) `-(pi+4)/2` `-2` (d) none of these

A

`(pi+4)/(2)`

B

`-(pi+4)/(2)`

C

`-2`

D

none of these

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To solve the problem step by step, we start with the given equations: 1. **Given Equations**: \[ x = t \cos t \] \[ y = t + \sin t ...
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