Respostas

2013-12-01T23:50:18-02:00
 \int\limits{e^{- \frac{y}{2} }} \, dx

Mudança de variável

u= -\frac{y}{2}

du=- \frac{1}{2}dy

dy=-2du

 \int{e^{u}}(-2)\, du=-2\int{e^{u}}\, du=-2e^{u}=-2e^{ -\frac{y}{2} }+c



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