Hello, I am trying to find the second derivative of $\displaystyle 7 secx$, and If I did it correctly, I got $\displaystyle 7(sec^3x+secxtan^2x)$

I also have another question, I think I need to do the product rule, but I have to find the first derivative of $\displaystyle 9x^2 sinx + 18 cosx -18 sinx$ Im not sure how to go about using the product rule with this, as there is like 3 terms. Any help would be appreciated, Thanks!