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MARMATHAPYZ $9.$

Find the derivative of each function.

$(4)y=\frac{4x^7}{7}$

$\frac{dy}{dx}=$

$$

$($b$)y=\frac{4}{7x^7}$

$\frac{dy}{dx}=$

$$

$

$($c$)y=\frac{(4x{)}^7}{7}$

$\frac{dy}{dx}=$

$$

$($d$)y=\frac{4}{(7x{)}^7}$

$\frac{dy}{dx}=$

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