Definite IntegrationHard

Question

Let  A = dt,  then dt  has the value :

Options

A. Ae-a
B.-  Ae-a
C.- ae-a
D.Aea

Solution

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

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