What is the integral of 6/(xsqrt(49+x^2)) ?

The integral of 6/(xsqrt(49+x^2)) is 6/7 ln|tan(1/2 arctan(1/7 x))|+C

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integral of 6/(xsqrt(49+x^2))

\int \frac{6}{x 49 + x ^{2}} d x

\frac{6}{7} ln tan (\frac{1}{2} arctan (\frac{1}{7} x)) + C

Solution steps

\int \frac{6}{x 49 + x ^{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}{x 49 + x ^{2}} d x

Apply Trigonometric Substitution

: \int \frac{sec ( u )}{7 tan ( u )} d u

= 6 \cdot \int \frac{sec ( u )}{7 tan ( u )} d u

Take the constant out:

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

= 6 \cdot \frac{1}{7} \cdot \int \frac{sec ( u )}{tan ( u )} d u

Apply u-substitution

: \int \frac{1}{v} d v

= 6 \cdot \frac{1}{7} \cdot \int \frac{1}{v} d v

Use the common integral:

\int \frac{1}{v} d v = ln (∣ v ∣)

= 6 \cdot \frac{1}{7} ln ∣ v ∣

Substitute back

= 6 \cdot \frac{1}{7} ln tan (\frac{arctan ( \frac{1}{7} x )}{2})

Simplify

6 \cdot \frac{1}{7} ln tan (\frac{arctan ( \frac{1}{7} x )}{2}) : \frac{6}{7} ln tan (\frac{1}{2} arctan (\frac{1}{7} x))

= \frac{6}{7} ln tan (\frac{1}{2} arctan (\frac{1}{7} x))

Add a constant to the solution

= \frac{6}{7} ln tan (\frac{1}{2} arctan (\frac{1}{7} x)) + C

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What is the integral of 6/(xsqrt(49+x^2)) ?
The integral of 6/(xsqrt(49+x^2)) is 6/7 ln|tan(1/2 arctan(1/7 x))|+C