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dnt
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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 I am 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.