HP F2226A - 48GII Graphic Calculator User Manual page 815

Step C3 Step C4
Step C5 = Step B5 = Step A6
The expression tree for the expression presented above is shown next:
The steps in the evaluation of the three terms (A1 through A6, B1 through B5,
and C1 through C5) are shown next to the circle containing numbers,
variables, or operators.
Page E-4