What is the integral from 0 to x of 5/(1+5x^2) ?

The integral from 0 to x of 5/(1+5x^2) is sqrt(5)arctan(sqrt(5)x)

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integral from 0 to x of 5/(1+5x^2)

\int_{0}^{x} \frac{5}{1 + 5 x ^{2}} d x

5 arctan (5 x)

Solution steps

\int_{0}^{x} \frac{5}{1 + 5 x ^{2}} d x

Take the constant out:

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

= 5 \cdot \int_{0}^{x} \frac{1}{1 + 5 x ^{2}} d x

Apply Integral Substitution

= 5 \cdot \int_{0}^{5 x} \frac{1}{5 ( 1 + u ^{2} )} d u

Take the constant out:

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

= 5 \cdot \frac{1}{5} \cdot \int_{0}^{5 x} \frac{1}{1 + u ^{2}} d u

Use the common integral:

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

= 5 \cdot \frac{1}{5} [arctan (u)]_{0}^{5 x}

Simplify

5 \cdot \frac{1}{5} [arctan (u)]_{0}^{5 x} : 5 [arctan (u)]_{0}^{5 x}

= 5 [arctan (u)]_{0}^{5 x}

Compute the boundaries:

arctan (5 x)

= 5 arctan (5 x)

What is the integral from 0 to x of 5/(1+5x^2) ?
The integral from 0 to x of 5/(1+5x^2) is sqrt(5)arctan(sqrt(5)x)