1、绘制参数方程，需要把各参数放在中括号里面：[cos(t), sin(t), t = 0 .. 2*Pi]
2、绘制极坐标方程：with(plots);polarplot(sin(5*t), t = 0 .. 20*Pi, thickness = 3, scaling = constrained);
3、绘制二元显函数的图像：plot3d(x^2+y^2, x=-2..2, y=-2..2);
4、绘制一元显函数图像：plot(x^3, x = -2 .. 2)
5、绘制空间参数方程曲线：spacecurve([t*衡痕贤伎sin(t), t*cos(t), t], t = 0 .. 6*Pi)
