What is the integral from-infinity to 0 of 4/(x^2+4) ?

The integral from-infinity to 0 of 4/(x^2+4) is pi

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integral from-infinity to 0 of 4/(x^2+4)

\int_{- \infty}^{0} \frac{4}{x ^{2} + 4} d x

π

Decimal

3.14159 \dots

Solution steps

\int_{- \infty}^{0} \frac{4}{x ^{2} + 4} d x

Compute the indefinite integral:

\int \frac{4}{x ^{2} + 4} d x = 2 arctan (\frac{x}{2}) + C

Compute the boundaries:

\int_{- \infty}^{0} \frac{4}{x ^{2} + 4} d x = 0 - (- π)

= 0 - (- π)

Simplify

= π

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What is the integral from-infinity to 0 of 4/(x^2+4) ?
The integral from-infinity to 0 of 4/(x^2+4) is pi