What is the integral of 7/(2xsqrt(9x^2-1)) ?

The integral of 7/(2xsqrt(9x^2-1)) is 7/2 arctan(sqrt(9x^2-1))+C

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integral of 7/(2xsqrt(9x^2-1))

\int \frac{7}{2 x 9 x ^{2} - 1} d x

\frac{7}{2} arctan (9 x^{2} - 1) + C

Solution steps

\int \frac{7}{2 x 9 x ^{2} - 1} d x

Take the constant out:

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

= \frac{7}{2} \cdot \int \frac{1}{x 9 x ^{2} - 1} d x

Apply u-substitution

: \int \frac{1}{u ^{2} + 1} d u

= \frac{7}{2} \cdot \int \frac{1}{u ^{2} + 1} d u

Use the common integral:

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

= \frac{7}{2} arctan (u)

Substitute back

u = 9 x^{2} - 1

= \frac{7}{2} arctan (9 x^{2} - 1)

Add a constant to the solution

= \frac{7}{2} arctan (9 x^{2} - 1) + C

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What is the integral of 7/(2xsqrt(9x^2-1)) ?
The integral of 7/(2xsqrt(9x^2-1)) is 7/2 arctan(sqrt(9x^2-1))+C