Evaluate the definite integral by using the method of integration by parts. 
Definitions:
Discount Rate
The discount rate is the interest rate used in discounted cash flow (DCF) analysis to present value future cash flows and assess the attractiveness of an investment.
Net Present Value
An approach to determining the value of an investment by discounting future cash flows to their present value.
Cash Flows
The total amount of money being transferred into and out of a business, particularly regarding calculating its operating, investing, and financing activities.
Discount Rate
Utilized in discounted cash flow analysis, this rate assists in calculating the present worth of forthcoming cash flows.
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