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

The integral of (x-2/x)(x+2/x) is (x^3)/3+4/x+C

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integral of (x-2/x)(x+2/x)

\int (x - \frac{2}{x}) (x + \frac{2}{x}) d x

\frac{x ^{3}}{3} + \frac{4}{x} + C

Solution steps

\int (x - \frac{2}{x}) (x + \frac{2}{x}) d x

Expand

(x - \frac{2}{x}) (x + \frac{2}{x}) : x^{2} - \frac{4}{x ^{2}}

= \int x^{2} - \frac{4}{x ^{2}} d x

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \int x^{2} d x - \int \frac{4}{x ^{2}} d x

\int x^{2} d x = \frac{x ^{3}}{3}

\int \frac{4}{x ^{2}} d x = - \frac{4}{x}

= \frac{x ^{3}}{3} - (- \frac{4}{x})

Simplify

= \frac{x ^{3}}{3} + \frac{4}{x}

Add a constant to the solution

= \frac{x ^{3}}{3} + \frac{4}{x} + C

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What is the integral of (x-2/x)(x+2/x) ?
The integral of (x-2/x)(x+2/x) is (x^3)/3+4/x+C