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Let f be a continuous, differentiable an...

Let f be a continuous, differentiable and bijective function. If the tangent to y = f(x) at x = a is also the normal to y = f(x) at x = b, then there exists at least one `c in (a, b)` such that

A

`f'(c) = 0`

B

`f'(c) gt 0`

C

`f'(c) lt 0`

D

none of these

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The correct Answer is:
A
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