Evaluate the Integral

Question

Evaluate the integral  .

Question options:

1)	2sec(3x)tan(3x) + C
2)	6sec(3x)tan(3x) + C
3)
4)	None of these

Answer 1

A basic trig derivative that you should be familiar with is that the derivative of tan(x) is sec²(x). This implies, of course, that the integral of sec²(u)du is tan(u) + C.