rovide an example of a function that would require a trigonometric substitution to integrate it.

[ f(x) = 1/9(2x)² ]

a) ( ∫ 1/9(2x)² ,dx )
b) ( ∫ 1/√9-(2x)² ,dx )
c) ( ∫ 1/9+4x² ,dx )
d) ( ∫ 1/sin² x ,dx )