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

A

`1- (1)/( sqrt(3) )`

B

`- (pi)/(12)`

C

`(pi)/(12)`

D

`sqrt(3) -1`

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The correct Answer is:
A
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