Using the examples in the Using Derivatives to Graph a Tangent Line section, in Desmos, plot the tangent line to the curve $($b$)$ from y$=($x$^(3)-4$x$)/($x$^(2)-2).$

By moving the point along the graph from left to right, identify the intervals where the slope of the tangent line is: c$)$ zero, and d$)$ does not exist.