How to solve

Using the power rule differentiate with respect to $x$ :

a$)y=2x^6+x^8$

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b$)y=\frac{1}{x^3}+3x^{\frac{3}{5}}$

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c$)y=4\sqrt[\phantom{2}]{x}+\frac{1}{4\sqrt[\phantom{2}]{x}}$

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