Answer
$y'=2πxsec^2(πx^2)$
Work Step by Step
First, find the derivative of y and u. Don't forget to apply chain rule for y':
$y'=sec^2u\times u'$
$u'=2πx$
Then plug in u and u' into y':
$y'=2πxsec^2(πx^2)$
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