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What's the derivative of $arctan (\frac{x}{5})$ $arctan (x/5)$ ?

1 Answer

Jun 22, 2018

$\frac{1}{5 \cdot (1 + \frac{x^{2}}{25})}$ $1/(5*(1+x^2/25))$

Explanation:

Note that

$(arctan(x))'=1/(1+x^2)$

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