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## Homework Statement

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

## Homework Equations

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

## 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.