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

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

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integral of (x/(x^2+y^2))

\int (\frac{x}{x ^{2} + y ^{2}}) d y

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

Solution steps

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

Take the constant out:

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

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

Apply Integral Substitution

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

Take the constant out:

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

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

Use the common integral:

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

= x \frac{1}{x} arctan (u)

Substitute back

u = \frac{y}{x}

= x \frac{1}{x} arctan (\frac{y}{x})

Simplify

x \frac{1}{x} arctan (\frac{y}{x}) : arctan (\frac{y}{x})

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

Add a constant to the solution

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

x^{- 2}, 8

x \to \infty lim (\frac{1}{8 x})

\int 2 x csc (2 x) cot (2 x) d x

\int x^{x} d x

\frac{\partial}{\partial y} (\frac{x y}{x ^{2} + y ^{2}})

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