What is the integral of 6/((9x^2+1)^2) ?

The integral of 6/((9x^2+1)^2) is arctan(3x)+1/2 sin(2arctan(3x))+C

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integral of 6/((9x^2+1)^2)

\int \frac{6}{( 9 x ^{2} + 1 ) ^{2}} d x

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

Solution steps

\int \frac{6}{( 9 x ^{2} + 1 ) ^{2}} d x

Take the constant out:

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

= 6 \cdot \int \frac{1}{( 9 x ^{2} + 1 ) ^{2}} d x

Apply Integral Substitution

= 6 \cdot \int \frac{1}{3 ( u ^{2} + 1 ) ^{2}} d u

Take the constant out:

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

= 6 \cdot \frac{1}{3} \cdot \int \frac{1}{( u ^{2} + 1 ) ^{2}} d u

Apply Trigonometric Substitution

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

= 6 \cdot \frac{1}{3} \cdot \int \frac{1}{sec ^{4} ( v ) cos ^{2} ( v )} d v

Rewrite using trig identities

= 6 \cdot \frac{1}{3} \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

= 6 \cdot \frac{1}{3} \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

= 6 \cdot \frac{1}{3} \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)

= 6 \cdot \frac{1}{3} \cdot \frac{1}{2} (v + \frac{1}{2} sin (2 v))

Substitute back

= 6 \cdot \frac{1}{3} \cdot \frac{1}{2} (arctan (3 x) + \frac{1}{2} sin (2 arctan (3 x)))

Simplify

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

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

Add a constant to the solution

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

y = \frac{arctan ( 2 x )}{x}

x \to 0 lim ((x + 1)^{l n (x)})

f (x) = 9 + 5 x^{2} - 2 x^{3}

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

\int_{1}^{4} ln (x) d x

What is the integral of 6/((9x^2+1)^2) ?
The integral of 6/((9x^2+1)^2) is arctan(3x)+1/2 sin(2arctan(3x))+C