Question

Use the equation given below to find f '' (π/ 3)  . f(x) = sec x

Answer 1

F'(x) = secxtanx
f''(x) = (secx)^3 + (secx)^2*(tanx)^2
Plug in $\pi$ / 3 and you get 8 + 12 = 20

Check me on that i did it in my head but it should be right