What is the derivative of $y = arctan (3 x)$ $y=arctan(3x)$ ?

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Answer 1 · 2014-10-05T11:59:29

Recall:

$(arctanx)'=1/{1+x^2}$

$y'=1/{1+(3x)^2}cdot(3x)'=3/{1+9x^2}$

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What is the derivative of y=arctan(3x)y=arctan(3x)y=arctan(3x)?