Definite IntegrationHard

Question

Let A = dt, then dt has the value :

Options

A. Ae^-a

B.- Ae^-a

C.- ae^-a

D.Ae^a

Solution

A =              ∴     I =
Put     t = a - y    ⇒   dt = - dy
then   I = - e-a = - Ae^-a

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