What is the integral from 0 to 4 of 1/(49x^2+81) ?

The integral from 0 to 4 of 1/(49x^2+81) is 1/63 arctan(28/9)

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integral from 0 to 4 of 1/(49x^2+81)

\int_{0}^{4} \frac{1}{49 x ^{2} + 81} d x

\frac{1}{63} arctan (\frac{28}{9})

Decimal

0.01999 \dots

Solution steps

\int_{0}^{4} \frac{1}{49 x ^{2} + 81} d x

Apply Integral Substitution

= \int_{0}^{\frac{28}{9}} \frac{1}{63 ( 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}{63} \cdot \int_{0}^{\frac{28}{9}} \frac{1}{u ^{2} + 1} d u

Use the common integral:

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

= \frac{1}{63} [arctan (u)]_{0}^{\frac{28}{9}}

Compute the boundaries:

arctan (\frac{28}{9})

= \frac{1}{63} arctan (\frac{28}{9})

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What is the integral from 0 to 4 of 1/(49x^2+81) ?
The integral from 0 to 4 of 1/(49x^2+81) is 1/63 arctan(28/9)