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

If ` x=a sec theta , y=b tan theta ` find `(d^2 y )/( dx^2) ` at `x = (pi )/( 6) `

A

`(-3 sqrt(3)b)/(a^(2))`

B

`(-2 sqrt(3)b)/(a)`

C

`(-3 sqrt(3)b)/(a)`

D

`(-b)/(3 sqrt(3)a^(2))`

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