Answer
$f'(x)=28x^6\sec^2(x^7)\tan(x^7)$
Work Step by Step
$f(x)=2sec^2(x^7)$
$f'(x)=4sec^1(x^7)\times\frac{dy}{dx}(sec(x^7))$
$f'(x)=4sec(x^7)\times{sec(x^7)tan(x^7)}\times7x^6$
$f'(x)=28x^6\sec^2(x^7)\tan(x^7)$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.