What is the integral of tan(X) ?

The integral of tan(X) is -ln|cos(X)|+C

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integral of tan(X)

\int tan (X) d X

- ln ∣ cos (X) ∣ + C

Solution steps

\int tan (X) d X

Rewrite using trig identities

= \int \frac{sin ( X )}{cos ( X )} d X

Apply u-substitution

: \int - \frac{1}{u} d u

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

Take the constant out:

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

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

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= - ln ∣ u ∣

Substitute back

u = cos (X)

= - ln ∣ cos (X) ∣

Add a constant to the solution

= - ln ∣ cos (X) ∣ + C

\frac{d y}{d x} = 4 y

y = \frac{6}{x}

4 t^{2}

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