What is the derivative of sec x? | Socratic
https://socratic.org/questions/what-is-the-derivative-of-sec-x
WEBJun 5, 2016 · 1 cosx ⋅ sinx cosx. Because 1 cosx = secx and sinx cosx = tanx, this is: secxtanx. Therefore, d dx secx = d dx 1 cosx = secxtanx. Pro Tip. You can use this method to find the derivative of cscx and cotx by recognizing cscx = 1 sinx and cotx = 1 tanx and using the quotient rule, as we did above.
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