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If f(x)=(x-x(0)) phi (x) and phi(x) is ...

If `f(x)=(x-x_(0)) phi (x) and phi(x) ` is continuous at x=`x_(0)`. Then `f'(x_(0))` is equal to

A

`phi'(x_(0))`

B

`phi(x_(0))`

C

`x_(0)phi(x_(0))`

D

None of these

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