Use Chain rule. I start by letting u=sec theta+tantheta so du= sectheta tantheta+sec^2 theta
then have derivative of u^(-3)
which is -3u^(-4) du by power rule, plug in u and du and get
r'=-3(sec theta+tantheta)^(-4) *(sectheta tantheta+sec^2)
Hope this helps! Please best me if it does!
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