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If `a. ne 0 , x = a (t + sin t) and y = a (1- cos t)` then `(d^(2) y) /dx^(2)" at "t = (2pi)/ 3 ` is

A

`4/a`

B

`1/(4a)`

C

`4a`

D

`a/4`

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The correct Answer is:
A
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