Integral of tg(x)dx dx

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$$\int\limits_{0}^{\frac{\pi}{2}} \tan{\left(x \right)}\, dx$$

Integral(tan(x), (x, 0, pi/2))

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]

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

Simplify

The graph

Plot the graph f(x)

The answer [src]

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$$\infty$$

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$$\infty$$

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Numerical answer [src]

37.3300702016737

37.3300702016737

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