Let \( f(x)=\lambda+\mu|x|+v|x|^{2} \), where \( \lambda, \mu, v \) are real constants. The \( f...
Let \( f(x)=\lambda+\mu|x|+v|x|^{2} \), where \( \lambda, \mu, v \) are real constants. The \( f^{\prime}(0) \) exists if
(a) \( \mu=0 \)
(b) \( v=0 \)
(c) \( \lambda=0 \)
(d) \( \mu=v \)
\( \mathrm{P} \)
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