Evaluate the following integrals

Let

Let 9x²-1=t

⇒ 18xdx=dt.

Also,

when x=1, t=8

and

when x=2, t=35.

Hence,

1

Evaluate the following integrals

2

Evaluate the following integrals

4

Evaluate the following integrals

5

Evaluate the following integrals