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# Evaluate ( int_{0}^{infty} e^{-x} d x )

JEE/Engineering Exams

Physics

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( begin{aligned} int_{0}^{infty} e^{-x} d x &=-left[frac{x}{e}right]_{0}^{infty} &=-(0-1) &= 1 { Ans } end{aligned} )

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