怎么用maple求函数在一点的偏导数

zhangxiaobo1987

比如说 f(x)=sin(x)在x=pi/2处的偏导，有一个命令吗？

tonnyw

Is this supposed to be something like the following?

df_dx :=diff(sin(x),x);
evalf(subs(x=pi/2, df_dx));