What is the integral from-2 to 2 of 1/(4+x^2) ?

The integral from-2 to 2 of 1/(4+x^2) is pi/4

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integral from-2 to 2 of 1/(4+x^2)

\int_{- 2}^{2} \frac{1}{4 + x ^{2}} d x

\frac{π}{4}

Decimal

0.78539 \dots

Solution steps

\int_{- 2}^{2} \frac{1}{4 + x ^{2}} d x

Apply Integral Substitution

= \int_{- 1}^{1} \frac{1}{2 ( u ^{2} + 1 )} d u

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= \frac{1}{2} \cdot \int_{- 1}^{1} \frac{1}{u ^{2} + 1} d u

Use the common integral:

\int \frac{1}{u ^{2} + 1} d u = arctan (u)

= \frac{1}{2} [arctan (u)]_{- 1}^{1}

Compute the boundaries:

\frac{π}{2}

= \frac{1}{2} \cdot \frac{π}{2}

Simplify

= \frac{π}{4}

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What is the integral from-2 to 2 of 1/(4+x^2) ?
The integral from-2 to 2 of 1/(4+x^2) is pi/4