I can't figure out these indefinite integrals using trigonometry
Integral(sec^4 x dx)
Integral(sec^3 x tanx dx)
Integral(sec^2 x tan^2 x dx)
Integral(sec x tan^3 x dx)
It seems everytime I attempt these particular problems I get stuck somewhere in the middle when it comes time to substitute!!!! It's so frustrating!!!