Solve this problem to get a cookie:

if f(x) = [-cos(sin(3x^2))]/[tan(3x)]
find f''(x)

(Yes this problem is quite tedious, but if you want the cookie, start working)

mathematica. does anyone know how to copy it without the backslashes? i had to take it out myself.

3 Cos[Sin[3 x^2]] Csc[3 x]^2 + 6 x Cos[3 x^2] Cot[3 x] Sin[Sin[3 x^2]]