Предмет: Алгебра, автор: Аноним

помогите, пожалуйста, срочно!
Вычислить несобственный интеграл или установить его расходимость.

Приложения:

Ответы

Автор ответа: NNNLLL54
1

Ответ:

\displaystyle \int \frac{e^{-x}\, dx}{e^{-x}+3}=-\int \frac{-e^{-x}\, dx}{e^{-x}+3}=-\int \frac{d(e^{-x}+3)}{e^{-x}+3}=-ln|e^{-x}+3|+C\\\\\\\int\limits_0^{+\infty }\, \frac{e^{-x}\, dx}{e^{-x}+3}=\lim\limits_{A \to +\infty}\int\limits_0^{A}\, \frac{e^{-x}\, dx}{e^{-x}+3}=-\lim\limits_{A \to +\infty}ln(e^{-x}+3)\Big|_0^{A}=\\\\\\=-\lim\limits_{A \to +\infty}\Big(ln(e^{-A}+3)-ln(1+3)\Big)=-\lim\limits_{A \to +\infty}\Big(ln(e^{-A}+3)-ln4\Big)=\\\\\\=-\Big(ln3-ln4\Big)=ln\frac{4}{3}\ ;\ \ \ sxoditsya

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