What is the integral of 1/(25-81x^2) ?

The integral of 1/(25-81x^2) is 1/90 (ln| 9/5 x+1|-ln| 9/5 x-1|)+C

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integral of 1/(25-81x^2)

\int \frac{1}{25 - 81 x ^{2}} d x

\frac{1}{90} (ln \frac{9}{5} x + 1 - ln \frac{9}{5} x - 1) + C

Solution steps

\int \frac{1}{25 - 81 x ^{2}} d x

Apply Integral Substitution

= \int \frac{1}{45 ( - u ^{2} + 1 )} d u

Take the constant out:

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

= \frac{1}{45} \cdot \int \frac{1}{- u ^{2} + 1} d u

Use the common integral:

\int \frac{1}{- u ^{2} + 1} d u = \frac{ln ∣ u + 1 ∣}{2} - \frac{ln ∣ u - 1 ∣}{2}

= \frac{1}{45} (\frac{ln ∣ u + 1 ∣}{2} - \frac{ln ∣ u - 1 ∣}{2})

Substitute back

u = \frac{9}{5} x

= \frac{1}{45} (\frac{ln \frac{9}{5} x + 1}{2} - \frac{ln \frac{9}{5} x - 1}{2})

Simplify

\frac{1}{45} (\frac{ln \frac{9}{5} x + 1}{2} - \frac{ln \frac{9}{5} x - 1}{2}) : \frac{1}{90} (ln \frac{9}{5} x + 1 - ln \frac{9}{5} x - 1)

= \frac{1}{90} (ln \frac{9}{5} x + 1 - ln \frac{9}{5} x - 1)

Add a constant to the solution

= \frac{1}{90} (ln \frac{9}{5} x + 1 - ln \frac{9}{5} x - 1) + C

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

\frac{d}{d x} ((\frac{x}{3} + 6 x)^{3})

\int_{0}^{\frac{π}{8}} (sin (2 x)) d x

\frac{d}{d x} (\frac{x}{x ^{- 1} + 5})

\frac{d}{d x} (x^{2} \cdot sin (\frac{1}{x ^{2}}))

What is the integral of 1/(25-81x^2) ?
The integral of 1/(25-81x^2) is 1/90 (ln| 9/5 x+1|-ln| 9/5 x-1|)+C