(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

basically what the topic states - derive the formula for the derivative of arctan x.

2. Relevant equations

d/dx (arctan x) = 1/(1+x^2)

3. The attempt at a solution

strange question because we already know the answer. but im not sure how to start this.

i know arctan x = y

therefore tan y = x

but what can i do with this? do i need to draw a right triangle and label all the sides? can someone help me get started? thanks.

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# Homework Help: How to derive the derivative formula of arctan x?

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