What is the integral of 3/((x^2+5)^2) ?

The integral of 3/((x^2+5)^2) is 3/(10sqrt(5))(arctan(x/(sqrt(5)))+1/2 sin(2arctan(x/(sqrt(5)))))+C

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integral of 3/((x^2+5)^2)

\int \frac{3}{( x ^{2} + 5 ) ^{2}} d x

\frac{3}{10 5} (arctan (\frac{x}{5}) + \frac{1}{2} sin (2 arctan (\frac{x}{5}))) + C

Solution steps

\int \frac{3}{( x ^{2} + 5 ) ^{2}} d x

Take the constant out:

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

= 3 \cdot \int \frac{1}{( x ^{2} + 5 ) ^{2}} d x

Apply Integral Substitution

= 3 \cdot \int \frac{5}{( 5 u ^{2} + 5 ) ^{2}} d u

Take the constant out:

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

= 35 \cdot \int \frac{1}{( 5 u ^{2} + 5 ) ^{2}} d u

Factor

\frac{1}{( 5 u ^{2} + 5 ) ^{2}}

= 35 \cdot \int \frac{1}{25 ( u ^{2} + 1 ) ^{2}} d u

Take the constant out:

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

= 35 \frac{1}{25} \cdot \int \frac{1}{( u ^{2} + 1 ) ^{2}} d u

Apply Trigonometric Substitution

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

= 35 \frac{1}{25} \cdot \int \frac{1}{sec ^{4} ( v ) cos ^{2} ( v )} d v

Rewrite using trig identities

= 35 \frac{1}{25} \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

= 35 \frac{1}{25} \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

= 35 \frac{1}{25} \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)

= 35 \frac{1}{25} \cdot \frac{1}{2} (v + \frac{1}{2} sin (2 v))

Substitute back

= 35 \frac{1}{25} \cdot \frac{1}{2} (arctan (\frac{x}{5}) + \frac{1}{2} sin (2 arctan (\frac{x}{5})))

Simplify

35 \frac{1}{25} \cdot \frac{1}{2} (arctan (\frac{x}{5}) + \frac{1}{2} sin (2 arctan (\frac{x}{5}))) : \frac{3}{10 5} (arctan (\frac{x}{5}) + \frac{1}{2} sin (2 arctan (\frac{x}{5})))

= \frac{3}{10 5} (arctan (\frac{x}{5}) + \frac{1}{2} sin (2 arctan (\frac{x}{5})))

Add a constant to the solution

= \frac{3}{10 5} (arctan (\frac{x}{5}) + \frac{1}{2} sin (2 arctan (\frac{x}{5}))) + C

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What is the integral of 3/((x^2+5)^2) ?
The integral of 3/((x^2+5)^2) is 3/(10sqrt(5))(arctan(x/(sqrt(5)))+1/2 sin(2arctan(x/(sqrt(5)))))+C