定积分与广义积分计算器

该计算器将尝试计算定积分（即带上下限的积分），包括广义积分，并显示求解步骤。

Enter a function:

Integrate with respect to:

Enter a lower limit:

If you need `-oo`, type -inf.

Enter an upper limit:

If you need `oo`, type inf.

Please write without any differentials such as `dx`, `dy` etc.

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Solution

Your input: calculate $$$\int_{0}^{\pi}\left( \cos{\left(2 x \right)} \right)dx$$$

First, calculate the corresponding indefinite integral: $$$\int{\cos{\left(2 x \right)} d x}=\frac{\sin{\left(2 x \right)}}{2}$$$ (for steps, see indefinite integral calculator)

According to the Fundamental Theorem of Calculus, $$$\int_a^b F(x) dx=f(b)-f(a)$$$, so just evaluate the integral at the endpoints, and that's the answer.

$$$\left(\frac{\sin{\left(2 x \right)}}{2}\right)|_{\left(x=\pi\right)}=0$$$

$$$\left(\frac{\sin{\left(2 x \right)}}{2}\right)|_{\left(x=0\right)}=0$$$

$$$\int_{0}^{\pi}\left( \cos{\left(2 x \right)} \right)dx=\left(\frac{\sin{\left(2 x \right)}}{2}\right)|_{\left(x=\pi\right)}-\left(\frac{\sin{\left(2 x \right)}}{2}\right)|_{\left(x=0\right)}=0$$$

Answer: $$$\int_{0}^{\pi}\left( \cos{\left(2 x \right)} \right)dx=0$$$

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定积分与广义积分计算器

逐步计算定积分和广义积分

Solution