### Home > CALC > Chapter 12 > Lesson 12.2.2 > Problem 12-78

12-78.

Let *u* = *x* + 1.

Once you rewrite the integrand, you should recognize it as a special case.

Let *u* = sin(*x*).

sin(2*x*) = 2sin(*x*)cos(*x*)

Let *u* = sin^{2}(*x*) + 1.

ln(*x*^{2}) = 2ln(*x*)