Question

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Answer 1

$f(x)=\sqrt[3]{arccos^2(x)}\\f(x)= arccos^{\frac{2}{3} }(x)\\f'(x)=\frac{2}{3}arccos^{-\frac{1}{3} }*[arccos(x)] '\\f'(x)=-\frac{2}{3\sqrt[3]{arccos(x)} } *\frac{1}{\sqrt{1-x^2} }$