What is the integral of 1/((4x^2+9)^2) ?

The integral of 1/((4x^2+9)^2) is 1/108 (arctan(2/3 x)+1/2 sin(2arctan(2/3 x)))+C

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integral of 1/((4x^2+9)^2)

\int \frac{1}{( 4 x ^{2} + 9 ) ^{2}} d x

\frac{1}{108} (arctan (\frac{2}{3} x) + \frac{1}{2} sin (2 arctan (\frac{2}{3} x))) + C

Solution steps

\int \frac{1}{( 4 x ^{2} + 9 ) ^{2}} d x

Apply Integral Substitution

= \int \frac{1}{54 ( 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}{54} \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}{54} \cdot \int \frac{1}{sec ^{4} ( v ) cos ^{2} ( v )} d v

Rewrite using trig identities

= \frac{1}{54} \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}{54} \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}{54} \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}{54} \cdot \frac{1}{2} (v + \frac{1}{2} sin (2 v))

Substitute back

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

Simplify

\frac{1}{54} \cdot \frac{1}{2} (arctan (\frac{2}{3} x) + \frac{1}{2} sin (2 arctan (\frac{2}{3} x))) : \frac{1}{108} (arctan (\frac{2}{3} x) + \frac{1}{2} sin (2 arctan (\frac{2}{3} x)))

= \frac{1}{108} (arctan (\frac{2}{3} x) + \frac{1}{2} sin (2 arctan (\frac{2}{3} x)))

Add a constant to the solution

= \frac{1}{108} (arctan (\frac{2}{3} x) + \frac{1}{2} sin (2 arctan (\frac{2}{3} x))) + C

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

sin (x^{3})

x \to 0 lim (- 3 x^{3} - 7 x + 8)

\int_{- 2}^{2} 5 d x

y^{^{''}} + 9 y^{^{'}} + 20 y = 0, y (0) = 1, y^{^{'}} (0) = 0

What is the integral of 1/((4x^2+9)^2) ?
The integral of 1/((4x^2+9)^2) is 1/108 (arctan(2/3 x)+1/2 sin(2arctan(2/3 x)))+C