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Let f(x) = lambda + mu|x|+nu|x|^2, where...

Let `f(x) = lambda + mu|x|+nu|x|^2`, where `lambda,mu, nu in R`, then `f'(0)` exists if

A

`mu =0`

B

v =0

C

` lambda=0`

D

`mu= v`

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A
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