According to Wolfram|Alpha, sometimes, the derivative of arctangent is(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\frac{d}{dx}\arctan x =\frac{1}{1+{x}^{2}}[/tex]

and sometimes,

[tex]\frac{d}{dx}\arctan x =\frac{\arctan x}{x}[/tex]

So are both of them equal?

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# Are these equal?

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