Definite IntegrationHard

Question

Let I1 =   and I2 = , then is

Options

A.3/e
B.e/3
C.3e
D.1/3e

Solution

I2 =
Let    1 - x3 = t     
⇒   - 3x2dx = dt
⇒ I2 =
⇒  = 3e.

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