What is the integral of 1/([(x^2+9)^2]) ?

The integral of 1/([(x^2+9)^2]) is 1/54 (arctan(x/3)+1/2 sin(2arctan(x/3)))+C

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integral of 1/([(x^2+9)^2])

\int \frac{1}{[ ( x ^{2} + 9 ) ^{2} ]} d x

\frac{1}{54} (arctan (\frac{x}{3}) + \frac{1}{2} sin (2 arctan (\frac{x}{3}))) + C

Solution steps

\int \frac{1}{[ ( x ^{2} + 9 ) ^{2} ]} d x

Simplify

= \int \frac{1}{( x ^{2} + 9 ) ^{2}} d x

Apply Integral Substitution

= \int \frac{1}{27 ( u ^{2} + 1 ) ^{2}} d u

Take the constant out:

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

= \frac{1}{27} \cdot \int \frac{1}{( u ^{2} + 1 ) ^{2}} d u

Apply Trigonometric Substitution

: \int \frac{1}{sec ^{4} ( v ) cos ^{2} ( v )} d v

= \frac{1}{27} \cdot \int \frac{1}{sec ^{4} ( v ) cos ^{2} ( v )} d v

Rewrite using trig identities

= \frac{1}{27} \cdot \int \frac{1 + cos ( 2 v )}{2} d v

Take the constant out:

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

= \frac{1}{27} \cdot \frac{1}{2} \cdot \int 1 + cos (2 v) d v

Apply the Sum Rule:

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

= \frac{1}{27} \cdot \frac{1}{2} (\int 1 d v + \int cos (2 v) d v)

\int 1 d v = v

\int cos (2 v) d v = \frac{1}{2} sin (2 v)

= \frac{1}{27} \cdot \frac{1}{2} (v + \frac{1}{2} sin (2 v))

Substitute back

= \frac{1}{27} \cdot \frac{1}{2} (arctan (\frac{x}{3}) + \frac{1}{2} sin (2 arctan (\frac{x}{3})))

Simplify

\frac{1}{27} \cdot \frac{1}{2} (arctan (\frac{x}{3}) + \frac{1}{2} sin (2 arctan (\frac{x}{3}))) : \frac{1}{54} (arctan (\frac{x}{3}) + \frac{1}{2} sin (2 arctan (\frac{x}{3})))

= \frac{1}{54} (arctan (\frac{x}{3}) + \frac{1}{2} sin (2 arctan (\frac{x}{3})))

Add a constant to the solution

= \frac{1}{54} (arctan (\frac{x}{3}) + \frac{1}{2} sin (2 arctan (\frac{x}{3}))) + C

\frac{d}{d x} (\frac{7 ^{x}}{x ^{3}})

\int \frac{e ^{2 x} - 1}{e ^{2 x} + 3} d x

x \to 3 lim (\frac{x + 1}{x ^{2} - 9})

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

\frac{d}{d x} (- \frac{1}{64} sin (\frac{x}{8}))

What is the integral of 1/([(x^2+9)^2]) ?
The integral of 1/([(x^2+9)^2]) is 1/54 (arctan(x/3)+1/2 sin(2arctan(x/3)))+C