Integral of tan dx

You have entered [src]

  1          
  /          
 |           
 |  tan(x) dx
 |           
/            
0

$$\int\limits_{0}^{1} \tan{\left(x \right)}\, dx$$

Integral(tan(x), (x, 0, 1))

Detail solution

Rewrite the integrand:

$\tan{\left(x \right)} = \frac{\sin{\left(x \right)}}{\cos{\left(x \right)}}$
Let $u = \cos{\left(x \right)}$ .

Then let $du = - \sin{\left(x \right)} dx$ and substitute $- du$ :

$\int \left(- \frac{1}{u}\right)\, du$
1. The integral of a constant times a function is the constant times the integral of the function:
  
  $\int \frac{1}{u}\, du = - \int \frac{1}{u}\, du$
  1. The integral of $\frac{1}{u}$ is $\log{\left(u \right)}$ .
  So, the result is: $- \log{\left(u \right)}$
Now substitute $u$ back in:

$- \log{\left(\cos{\left(x \right)} \right)}$
Add the constant of integration:

$- \log{\left(\cos{\left(x \right)} \right)}+ \mathrm{constant}$

The answer is:

$- \log{\left(\cos{\left(x \right)} \right)}+ \mathrm{constant}$

The answer (Indefinite) [src]

  /                           
 |                            
 | tan(x) dx = C - log(cos(x))
 |                            
/

$$\int \tan{\left(x \right)}\, dx = C - \log{\left(\cos{\left(x \right)} \right)}$$

Simplify

The graph

Plot the graph f(x)

The answer [src]

-log(cos(1))

$$- \log{\left(\cos{\left(1 \right)} \right)}$$

-log(cos(1))

$$- \log{\left(\cos{\left(1 \right)} \right)}$$

-log(cos(1))

Numerical answer [src]

0.615626470386014

0.615626470386014

The graph

Use the examples entering the upper and lower limits of integration.