Integral of tg(4*x) dx

The solution

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 |  tan(4*x) dx
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$$\int\limits_{0}^{1} \tan{\left(4 x \right)}\, dx$$

Integral(tan(4*x), (x, 0, 1))

Detail solution

Rewrite the integrand:

$\tan{\left(4 x \right)} = \frac{\sin{\left(4 x \right)}}{\cos{\left(4 x \right)}}$
There are multiple ways to do this integral.
Method #1
1. Let $u = \cos{\left(4 x \right)}$ .
  
  Then let $du = - 4 \sin{\left(4 x \right)} dx$ and substitute $- \frac{du}{4}$ :
  
  $\int \left(- \frac{1}{4 u}\right)\, du$
  1. The integral of a constant times a function is the constant times the integral of the function:
    
    $\int \frac{1}{u}\, du = - \frac{\int \frac{1}{u}\, du}{4}$
    1. The integral of $\frac{1}{u}$ is $\log{\left(u \right)}$ .
    So, the result is: $- \frac{\log{\left(u \right)}}{4}$
  Now substitute $u$ back in:
  
  $- \frac{\log{\left(\cos{\left(4 x \right)} \right)}}{4}$
Method #2
1. Let $u = 4 x$ .
  
  Then let $du = 4 dx$ and substitute $\frac{du}{4}$ :
  
  $\int \frac{\sin{\left(u \right)}}{4 \cos{\left(u \right)}}\, du$
  1. The integral of a constant times a function is the constant times the integral of the function:
    
    $\int \frac{\sin{\left(u \right)}}{\cos{\left(u \right)}}\, du = \frac{\int \frac{\sin{\left(u \right)}}{\cos{\left(u \right)}}\, du}{4}$
    1. Let $u = \cos{\left(u \right)}$ .
      
      Then let $du = - \sin{\left(u \right)} du$ and substitute $- du$ :
      
      $\int \left(- \frac{1}{u}\right)\, du$
      
      The integral of a constant times a function is the constant times the integral of the function:
      
      $\int \frac{1}{u}\, du = - \int \frac{1}{u}\, du$
      
      The integral of $\frac{1}{u}$ is $\log{\left(u \right)}$ .
      
      So, the result is: $- \log{\left(u \right)}$
      
      Now substitute $u$ back in:
      
      $- \log{\left(\cos{\left(u \right)} \right)}$
    So, the result is: $- \frac{\log{\left(\cos{\left(u \right)} \right)}}{4}$
  Now substitute $u$ back in:
  
  $- \frac{\log{\left(\cos{\left(4 x \right)} \right)}}{4}$
Add the constant of integration:

$- \frac{\log{\left(\cos{\left(4 x \right)} \right)}}{4}+ \mathrm{constant}$

The answer is:

$- \frac{\log{\left(\cos{\left(4 x \right)} \right)}}{4}+ \mathrm{constant}$

The answer (Indefinite) [src]

  /                               
 |                   log(cos(4*x))
 | tan(4*x) dx = C - -------------
 |                         4      
/

$$\int \tan{\left(4 x \right)}\, dx = C - \frac{\log{\left(\cos{\left(4 x \right)} \right)}}{4}$$

Simplify

The graph

Plot the graph f(x)

The answer [src]

  log(-cos(4))   pi*I
- ------------ - ----
       4          4

$$- \frac{\log{\left(- \cos{\left(4 \right)} \right)}}{4} - \frac{i \pi}{4}$$

  log(-cos(4))   pi*I
- ------------ - ----
       4          4

$$- \frac{\log{\left(- \cos{\left(4 \right)} \right)}}{4} - \frac{i \pi}{4}$$

-log(-cos(4))/4 - pi*i/4

Numerical answer [src]

1.6900933662682

1.6900933662682

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

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Identical expressions

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Integral of tg(4*x) dx

Limits of integration:

The graph:

Piecewise:

The solution

Method #1

Method #2