What is the integral of 2/(2+x^2) ?

The integral of 2/(2+x^2) is sqrt(2)arctan(x/(sqrt(2)))+C

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integral of 2/(2+x^2)

\int \frac{2}{2 + x ^{2}} d x

2 arctan (\frac{x}{2}) + C

Solution steps

\int \frac{2}{2 + x ^{2}} d x

Take the constant out:

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

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

Apply Integral Substitution

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

Take the constant out:

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

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

Use the common integral:

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

= 2 \cdot \frac{1}{2} arctan (u)

Substitute back

u = \frac{x}{2}

= 2 \cdot \frac{1}{2} arctan (\frac{x}{2})

Simplify

2 \cdot \frac{1}{2} arctan (\frac{x}{2}) : 2 arctan (\frac{x}{2})

= 2 arctan (\frac{x}{2})

Add a constant to the solution

= 2 arctan (\frac{x}{2}) + C

y^{^{'}} = x \cdot y

\frac{d y}{d t} + \frac{y}{t} = 2

y^{^{''}} + 4 y = tan (2 x)

x \to \frac{π}{4} lim (cos (2 x))

\int \frac{1}{81 + x ^{2}} d x

What is the integral of 2/(2+x^2) ?
The integral of 2/(2+x^2) is sqrt(2)arctan(x/(sqrt(2)))+C