What is the integral from 0 to 1/pi of 1/(1+(pix)^2) ?

The integral from 0 to 1/pi of 1/(1+(pix)^2) is 1/4

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integral from 0 to 1/pi of 1/(1+(pix)^2)

\int_{0}^{\frac{1}{π}} \frac{1}{1 + ( π x ) ^{2}} d x

\frac{1}{4}

Decimal

0.25

Solution steps

\int_{0}^{\frac{1}{π}} \frac{1}{1 + ( π x ) ^{2}} d x

Apply u-substitution

= \int_{0}^{1} \frac{1}{π ( 1 + u ^{2} )} d u

Take the constant out:

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

= \frac{1}{π} \cdot \int_{0}^{1} \frac{1}{1 + u ^{2}} d u

Use the common integral:

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

= \frac{1}{π} [arctan (u)]_{0}^{1}

Compute the boundaries:

\frac{π}{4}

= \frac{1}{π} \cdot \frac{π}{4}

Simplify

= \frac{1}{4}

What is the integral from 0 to 1/pi of 1/(1+(pix)^2) ?
The integral from 0 to 1/pi of 1/(1+(pix)^2) is 1/4