What is the integral of (tan(x))/2 ?

The integral of (tan(x))/2 is -1/2 ln|cos(x)|+C

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integral of (tan(x))/2

integral

\frac{tan ( x )}{2}

- \frac{1}{2} ln ∣ cos (x) ∣ + C

Solution steps

\int \frac{tan ( x )}{2} d x

Take the constant out:

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

= \frac{1}{2} \cdot \int tan (x) d x

Rewrite using trig identities

= \frac{1}{2} \cdot \int \frac{sin ( x )}{cos ( x )} d x

Apply u-substitution

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

Take the constant out:

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

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

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= \frac{1}{2} (- ln ∣ u ∣)

Substitute back

u = cos (x)

= \frac{1}{2} (- ln ∣ cos (x) ∣)

Simplify

= - \frac{1}{2} ln ∣ cos (x) ∣

Add a constant to the solution

= - \frac{1}{2} ln ∣ cos (x) ∣ + C

What is the integral of (tan(x))/2 ?
The integral of (tan(x))/2 is -1/2 ln|cos(x)|+C