## dy/dx command

The dy/dx command finds a numeric derivative, which approximates the first
derivative of an expression with respect to the x variable at the trace cursor
location while viewing a graph.

While viewing the graph of a function, press
to view the MATH functions.

Press .

If more than one function is graphed, use
to select the desired curve and then use
to trace the curve to the point for which the value of the derivative is needed.

**Note:** If the cursor cannot be placed close enough to the desired point,
use the ZOOM feature and repeat the process.

Pressing will display the value
(or approximate value) of dy/dx at the point.