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#### karush

##### Well-known member

- Jan 31, 2012

- 2,998

$\int x (5^{-x^2})dx= -\frac{1}{2} \int 5^{-x^{2}}(-2x)dx$

how is $\frac{1}{2}$ in front of the $\int$ derived

how is $\frac{1}{2}$ in front of the $\int$ derived

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