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Suppose that the equation f(x)=x^2+bx+c ...

Suppose that the equation `f(x)=x^2+bx+c` has two distinct real roots `alphaandbeta`. The angle between the tangent to the curve y = f(x) at the point `((alpha+beta)/2,f((alpha+beta)/2))` and the positive direction of the x-axis is

A

`0^@`

B

`30^@`

C

`60^@`

D

`90^@`

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The correct Answer is:
A
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