What is the integral from 0 to 1 of 2arctan(x) ?

The integral from 0 to 1 of 2arctan(x) is pi/2-ln(2)

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integral from 0 to 1 of 2arctan(x)

\int_{0}^{1} 2 arctan (x) d x

\frac{π}{2} - ln (2)

Decimal Notation

0.87764 \dots

Solution steps

\int_{0}^{1} 2 arctan (x) d x

Take the constant out:

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

= 2 \cdot \int_{0}^{1} arctan (x) d x

Apply Integration By Parts

: [x arctan (x) - \int \frac{x}{x ^{2} + 1} d x]_{0}^{1}

= 2 [x arctan (x) - \int \frac{x}{x ^{2} + 1} d x]_{0}^{1}

\int \frac{x}{x ^{2} + 1} d x = \frac{1}{2} ln x^{2} + 1

= 2 [x arctan (x) - \frac{1}{2} ln x^{2} + 1]_{0}^{1}

Compute the boundaries:

\frac{π}{4} - \frac{1}{2} ln (2)

= 2 (\frac{π}{4} - \frac{1}{2} ln (2))

Simplify

= \frac{π}{2} - ln (2)

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What is the integral from 0 to 1 of 2arctan(x) ?
The integral from 0 to 1 of 2arctan(x) is pi/2-ln(2)