What is (d^2)/(dx^2)(sqrt(r)+\sqrt[9]{r}) ?

The answer to (d^2)/(dx^2)(sqrt(r)+\sqrt[9]{r}) is

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(d^2)/(dx^2)(sqrt(r)+\sqrt[9]{r})

\frac{d ^{2}}{d x ^{2}} (r + 9 r)

\frac{81 ( 2 \frac{d ^{2} r}{d x ^{2}} r - \frac{d r}{d x} ^{2} ) r ^{\frac{23}{18}} + 4 ( 9 \frac{d ^{2} r}{d x ^{2}} r ^{\frac{8}{9}} 9 r - 8 \frac{d r}{d x} ^{2} ) r ^{\frac{8}{9}}}{324 r ^{\frac{25}{9}}}

Solution steps

\frac{d ^{2}}{d x ^{2}} (r + 9 r)

\frac{d}{d x} (r + 9 r) = \frac{\frac{d r}{d x}}{2 r} + \frac{\frac{d r}{d x}}{9 r ^{\frac{8}{9}}}

= \frac{d}{d x} (\frac{\frac{d r}{d x}}{2 r} + \frac{\frac{d r}{d x}}{9 r ^{\frac{8}{9}}})

\frac{d}{d x} (\frac{\frac{d r}{d x}}{2 r} + \frac{\frac{d r}{d x}}{9 r ^{\frac{8}{9}}}) = \frac{81 ( 2 \frac{d ^{2} r}{d x ^{2}} r - \frac{d r}{d x} ^{2} ) r ^{\frac{23}{18}} + 4 ( 9 \frac{d ^{2} r}{d x ^{2}} r ^{\frac{8}{9}} 9 r - 8 \frac{d r}{d x} ^{2} ) r ^{\frac{8}{9}}}{324 r ^{\frac{25}{9}}}

= \frac{81 ( 2 \frac{d ^{2} r}{d x ^{2}} r - \frac{d r}{d x} ^{2} ) r ^{\frac{23}{18}} + 4 ( 9 \frac{d ^{2} r}{d x ^{2}} r ^{\frac{8}{9}} 9 r - 8 \frac{d r}{d x} ^{2} ) r ^{\frac{8}{9}}}{324 r ^{\frac{25}{9}}}

\frac{d}{d x} (x + \frac{4}{x + 3})

\frac{d}{d x} ((tan (x))^{x})

\frac{d y}{d x} = \frac{cos ( 6 x )}{e ^{6 y}}

\frac{d y}{d x} = \frac{3 x}{y + x ^{2} y}

\frac{\partial}{\partial x} (\frac{x - y}{x ^{2} + y ^{2}})

What is (d^2)/(dx^2)(sqrt(r)+\sqrt[9]{r}) ?
The answer to (d^2)/(dx^2)(sqrt(r)+\sqrt[9]{r}) is