求导函数：
输入一个原函数（即需要求导的函数），然后设置需要求导的变量和求导的阶数，点击“下一步”按钮，即可获得该函数相应阶数的导函数。
注意，输入的函数支持数学函数和其它常量。
输入一个原函数（即需要求导的函数），然后设置需要求导的变量和求导的阶数，点击“下一步”按钮，即可获得该函数相应阶数的导函数。
注意，输入的函数支持数学函数和其它常量。
本次共计算 1 个题目：每一题对 x 求 2 阶导数。
注意，变量是区分大小写的。
\begin{equation}\begin{split}【1/1】求函数\frac{(r - lrsin(x))}{({(l - sin(x))}^{2} + rrcos(x)cos(x))} 关于 x 的 2 阶导数：\\\end{split}\end{equation}
\begin{equation}\begin{split}\\解:&\\ &原函数 = - \frac{rlsin(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))} + \frac{r}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))}\\&\color{blue}{函数的第 1 阶导数：}\\&\frac{d\left( - \frac{rlsin(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))} + \frac{r}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))}\right)}{dx}\\=& - (\frac{-(-2lcos(x) + 0 + 2sin(x)cos(x) + r^{2}*-2cos(x)sin(x))}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}})rlsin(x) - \frac{rlcos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))} + (\frac{-(-2lcos(x) + 0 + 2sin(x)cos(x) + r^{2}*-2cos(x)sin(x))}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}})r + 0\\=&\frac{-2rl^{2}sin(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} + \frac{2rlsin^{2}(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - \frac{2r^{3}lsin^{2}(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - \frac{rlcos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))} + \frac{2rlcos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - \frac{2rsin(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} + \frac{2r^{3}sin(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}}\\\\ &\color{blue}{函数的第 2 阶导数：} \\&\frac{d\left( \frac{-2rl^{2}sin(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} + \frac{2rlsin^{2}(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - \frac{2r^{3}lsin^{2}(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - \frac{rlcos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))} + \frac{2rlcos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - \frac{2rsin(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} + \frac{2r^{3}sin(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}}\right)}{dx}\\=&-2(\frac{-2(-2lcos(x) + 0 + 2sin(x)cos(x) + r^{2}*-2cos(x)sin(x))}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}})rl^{2}sin(x)cos(x) - \frac{2rl^{2}cos(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - \frac{2rl^{2}sin(x)*-sin(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} + 2(\frac{-2(-2lcos(x) + 0 + 2sin(x)cos(x) + r^{2}*-2cos(x)sin(x))}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}})rlsin^{2}(x)cos(x) + \frac{2rl*2sin(x)cos(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} + \frac{2rlsin^{2}(x)*-sin(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - 2(\frac{-2(-2lcos(x) + 0 + 2sin(x)cos(x) + r^{2}*-2cos(x)sin(x))}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}})r^{3}lsin^{2}(x)cos(x) - \frac{2r^{3}l*2sin(x)cos(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - \frac{2r^{3}lsin^{2}(x)*-sin(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - (\frac{-(-2lcos(x) + 0 + 2sin(x)cos(x) + r^{2}*-2cos(x)sin(x))}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}})rlcos(x) - \frac{rl*-sin(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))} + 2(\frac{-2(-2lcos(x) + 0 + 2sin(x)cos(x) + r^{2}*-2cos(x)sin(x))}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}})rlcos(x) + \frac{2rl*-sin(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - 2(\frac{-2(-2lcos(x) + 0 + 2sin(x)cos(x) + r^{2}*-2cos(x)sin(x))}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}})rsin(x)cos(x) - \frac{2rcos(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - \frac{2rsin(x)*-sin(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} + 2(\frac{-2(-2lcos(x) + 0 + 2sin(x)cos(x) + r^{2}*-2cos(x)sin(x))}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}})r^{3}sin(x)cos(x) + \frac{2r^{3}cos(x)cos(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} + \frac{2r^{3}sin(x)*-sin(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}}\\=&\frac{-8rl^{3}sin(x)cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}} + \frac{16rl^{2}sin^{2}(x)cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}} - \frac{16r^{3}l^{2}sin^{2}(x)cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}} - \frac{4rl^{2}cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} + \frac{6rlsin(x)cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - \frac{8rlsin^{3}(x)cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}} + \frac{16r^{3}lsin^{3}(x)cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}} - \frac{6r^{3}lsin(x)cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - \frac{8r^{5}lsin^{3}(x)cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}} - \frac{16rlsin(x)cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}} + \frac{16r^{3}lsin(x)cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}} + \frac{2r^{3}lsin^{3}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} + \frac{rlsin(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))} + \frac{8rl^{2}cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}} - \frac{2rlsin^{3}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} + \frac{2rl^{2}sin^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - \frac{2rlsin(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} + \frac{8rsin^{2}(x)cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}} - \frac{16r^{3}sin^{2}(x)cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}} - \frac{2rcos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} + \frac{8r^{5}sin^{2}(x)cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{3}} + \frac{2rsin^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} + \frac{2r^{3}cos^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}} - \frac{2r^{3}sin^{2}(x)}{(-2lsin(x) + l^{2} + sin^{2}(x) + r^{2}cos^{2}(x))^{2}}\\ \end{split}\end{equation}
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