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Popular >

derivative of arctan(9/x)

Solution

\frac{d}{d x} (arctan (\frac{9}{x}))

Solution

- \frac{9}{81 + x ^{2}}

Solution steps

\frac{d}{d x} (arctan (\frac{9}{x}))

Apply the chain rule:

\frac{1}{( \frac{9}{x} ) ^{2} + 1} \frac{d}{d x} (\frac{9}{x})

= \frac{1}{( \frac{9}{x} ) ^{2} + 1} \frac{d}{d x} (\frac{9}{x})

\frac{d}{d x} (\frac{9}{x}) = - \frac{9}{x ^{2}}

= \frac{1}{( \frac{9}{x} ) ^{2} + 1} (- \frac{9}{x ^{2}})

Simplify

\frac{1}{( \frac{9}{x} ) ^{2} + 1} (- \frac{9}{x ^{2}}) : - \frac{9}{81 + x ^{2}}

= - \frac{9}{81 + x ^{2}}

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Frequently Asked Questions (FAQ)

What is the derivative of arctan(9/x) ?
The derivative of arctan(9/x) is -9/(81+x^2)
What is the first derivative of arctan(9/x) ?
The first derivative of arctan(9/x) is -9/(81+x^2)