$$$\frac{x \sinh{\left(x \right)}}{\left(\cosh^{2}{\left(x \right)} + 1\right)^{2}}$$$ 的积分

该计算器将求出$$$\frac{x \sinh{\left(x \right)}}{\left(\cosh^{2}{\left(x \right)} + 1\right)^{2}}$$$的积分/原函数，并显示步骤。

求$$$\int \frac{x \sinh{\left(x \right)}}{\left(\cosh^{2}{\left(x \right)} + 1\right)^{2}}\, dx$$$。