4 Evaluate the following integrals by method of trigonometric substitution and state which case number from the lecture 4 notes each integral falls under a b ITA Hint c Hint I da x x 4 sec Cos tan 0 sin 0 x dx tan 0 sec 9 dx sin 20 cos 0 Now perform a simple u sub to integrate sec 0 1 sec sec 0 cos 0