Calculus Examples

$\int \ln^{2} (x) d x$

Step 1

This integral could not be completed using u-substitution. Mathway will use another method.

Step 2

Integrate by parts using the formula $\int u d v = u v - \int v d u$ , where $u = \ln^{2} (x)$ and $d v = 1$ .

$\ln^{2} (x) x - \int x \frac{\ln (x^{2})}{x} d x$

Step 3

Simplify.

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Step 3.1

Combine $x$ and $\frac{\ln (x^{2})}{x}$ .

$\ln^{2} (x) x - \int \frac{x \ln (x^{2})}{x} d x$

Step 3.2

Cancel the common factor of $x$ .

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Step 3.2.1

Cancel the common factor.

$\ln^{2} (x) x - \int \frac{x \ln (x^{2})}{x} d x$

Step 3.2.2

Divide $\ln (x^{2})$ by $1$ .

$\ln^{2} (x) x - \int \ln (x^{2}) d x$

Step 4

Rewrite $\ln (x^{2})$ as $2 \ln (x)$ .

$\ln^{2} (x) x - \int 2 \ln (x) d x$

Step 5

Since $2$ is constant with respect to $x$ , move $2$ out of the integral.

$\ln^{2} (x) x - (2 \int \ln (x) d x)$

Step 6

Multiply $2$ by $- 1$ .

$\ln^{2} (x) x - 2 \int \ln (x) d x$

Step 7

Integrate by parts using the formula $\int u d v = u v - \int v d u$ , where $u = \ln (x)$ and $d v = 1$ .

$\ln^{2} (x) x - 2 (\ln (x) x - \int x \frac{1}{x} d x)$

Step 8

Simplify.

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Step 8.1

Combine $x$ and $\frac{1}{x}$ .

$\ln^{2} (x) x - 2 (\ln (x) x - \int \frac{x}{x} d x)$

Step 8.2

Cancel the common factor of $x$ .

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Step 8.2.1

Cancel the common factor.

$\ln^{2} (x) x - 2 (\ln (x) x - \int \frac{x}{x} d x)$

Step 8.2.2

Rewrite the expression.

$\ln^{2} (x) x - 2 (\ln (x) x - \int d x)$

Step 9

Apply the constant rule.

$\ln^{2} (x) x - 2 (\ln (x) x - (x + C))$

Step 10

Rewrite $\ln^{2} (x) x - 2 (\ln (x) x - (x + C))$ as $\ln^{2} (x) x - 2 \ln (x) x + 2 x + C$ .

$\ln^{2} (x) x - 2 \ln (x) x + 2 x + C$