\[\text{Найти}\ \ f'(x),\ \ \text{если}\ \ \ f(x) =\sqrt[4]{x}.\]
\[f'(x)={1\over{4\sqrt[4]{x^3}}}\]
\[f'(x)={1\over{4\sqrt[4]{x}}}\]
\[f'(x)={1\over{\sqrt[4]{x^3}}}\]