Which cannot be evaluated using simple substitution

Question

Which of the following integrals cannot be evaluated using a simple substitution?

Question options:

1)
2)
3)
4)

Answer 1

Only integral 4) need trigonometric substitution x = sect.

Integrals: 1) dont need substitution,

2) table integral equal sin^-1x + C,

3) we can evaluate it by substitution t = 1-x², then dt = -2xdx and xdx = - 1/2·dt

Answer: all 4 integrals can be expressed in elementary functions.