Evaluate the integral: ∫tan3(x)sec^6(x)dx. Use C for the constant of integration.
A) ∫tan2(x)sec^6(x)dx
B) ∫tan^4(x)sec^6(x)dx
C) ∫tan3(x)sec^5(x)dx
D) ∫tan3(x)sec^7(x)dx