a) $f'\left( x
\right)=3{{x}^{2}}+1$
b) $f'\left( x
\right)=3{{x}^{3}}+x$
c) $f'\left( x
\right)=3{{x}^{2}}+x$
$f\left( x
\right)={{x}^{3}}+x=1\ \cdot \,{{x}^{3}}+1\ \cdot \,{{x}^{1}}$
la
derivada pedida se calcula:
$f'\left(
x \right)=1\ \cdot 3\ \cdot {{x}^{3-1}}+1\ \cdot \ 1\ \cdot \
{{x}^{1-1}}=3{{x}^{2}}+1{{x}^{0}}=3{{x}^{2}}+1$
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