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A line tangent to the graph of the function y=f(x) at the pointx =a forms an angle `pi/3` with y axis abd at x=b and `pi/4` with x-axis then `int_a^bf''(x)dx`

A

`(1/sqrt3)-1`

B

(-pi/12)`

C

(pi/12)

D

`sqrt3-1`

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The correct Answer is:
A
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