What is the integral of tan((3x)/7) ?

The integral of tan((3x)/7) is -7/3 ln|cos((3x)/7)|+C

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integral of tan((3x)/7)

\int tan (\frac{3 x}{7}) d x

- \frac{7}{3} ln cos (\frac{3 x}{7}) + C

Solution steps

\int tan (\frac{3 x}{7}) d x

Apply u-substitution

= \int tan (u) \frac{7}{3} d u

Take the constant out:

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

= \frac{7}{3} \cdot \int tan (u) d u

Rewrite using trig identities

= \frac{7}{3} \cdot \int \frac{sin ( u )}{cos ( u )} d u

Apply u-substitution

= \frac{7}{3} \cdot \int - \frac{1}{v} d v

Take the constant out:

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

= \frac{7}{3} (- \int \frac{1}{v} d v)

Use the common integral:

\int \frac{1}{v} d v = ln (∣ v ∣)

= \frac{7}{3} (- ln ∣ v ∣)

Substitute back

= \frac{7}{3} (- ln cos (\frac{3 x}{7}))

Simplify

= - \frac{7}{3} ln cos (\frac{3 x}{7})

Add a constant to the solution

= - \frac{7}{3} ln cos (\frac{3 x}{7}) + C

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What is the integral of tan((3x)/7) ?
The integral of tan((3x)/7) is -7/3 ln|cos((3x)/7)|+C