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If x= a sec theta ,y =a tan theta ,then...

If ` x= a sec theta ,y =a tan theta ,then " at " theta = (pi)/(4) ,(d^(2)y)/(dx^(2) ) =`

A

` (-1)/(a) `

B

` (1)/(a) `

C

`-a`

D

a

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The correct Answer is:
A
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