Operation Manual

Chapter 3: Function Graphing 93
To find an intersection, follow these steps.
1. Select
5:intersect from the CALCULATE menu. The current graph is displayed with First curve?
in the bottom-left corner.
2. Press † or }, if necessary, to move the cursor to the first function, and then press Í.
Second curve? is displayed in the bottom-left corner.
3. Press † or }, if necessary, to move the cursor to the second function, and then press Í.
4. Press ~ or | to move the cursor to the point that is your guess as to location of the intersection,
and then press Í.
The cursor is on the solution and the coordinates are displayed, even if
CoordOff format is selected.
Intersection is displayed in the bottom-left corner. To restore the free-moving cursor, press |, }, ~, or
†.
dy/dx
dy/dx (numerical derivative) finds the numerical derivative (slope) of a function at a point, with H=1âL3.
To find a function’s slope at a point, follow these steps.
1. Select 6:dy/dx from the CALCULATE menu. The current graph is displayed.
2. Press } or † to select the function for which you want to find the numerical derivative.
3. Press | or ~ (or enter a value) to select the X value at which to calculate the derivative, and then
press Í.
The cursor is on the solution and the numerical derivative is displayed.
To move to the same x-value for other selected functions, press } or †. To restore the free-moving
cursor, press | or ~.
‰
f(x)dx
‰f(x)dx (numerical integral) finds the numerical integral of a function in a specified interval. It uses the
fnInt( function, with a tolerance of H=1âL3.
To find the numerical integral of a function, follow these steps.
1. Select 7:‰f(x)dx from the CALCULATE menu. The current graph is displayed with Lower Limit? in
the bottom-left corner.
2. Press } or † to move the cursor to the function for which you want to calculate the integral.