Example 5: Perform the integration 2 2 ∫ 1 + 1 Make the substitution, = 1 + Then = , or = The integral becomes, 2 2 2 2 2 ∫ = ∫ . = ∫ 1 + 1 1 1 Since = 1 + , then = − 1 The integral becomes, 2 − 1 ∫ 1 21