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1. $\int {xe}^{- x} dx = ?$

A. $- {xe}^{- x} - e^{x} + k$
B. $- {xe}^{- x} - e^{x} + k$
C. $- {xe}^{- x} - e^{x} + k$
D. $- {xe}^{- x} - e^{x} + k$

Answer: Option A

Explanation:

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