Definite IntegrationHard

Question

If I1 = and I2 = dx, then

Options

A.I1 = I2
B.2 I1 = I2
C.I1 = 2 I2
D.none of these

Solution

I1 =
Let lnx = t    ⇒   x = et   ⇒   dx = etdt
∴ I1 = = I2

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