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# HP 32sii Calculator - Entering and Evaluating Equations

Introduction
The HP 32sii can be used for specifying an equation to evaluate.
Calculator symbol key
The procedures in this document use the following text to represent symbol keys:
 Key Description Text Representation Right shift key RS Left-shift key LS Accumulates statistical data SUM+ pi pi
Calculating with an equation
Suppose there is a frequent need to determine the volume of a straight pipe. The equation is
V = .25 pi d2 l
Where d is the inside diameter of the pipe, and l is its length.
The calculation could be keyed in over and over. For example:
.25, ENTER, RS, pi, x, 2.5, LS, x2, x, 16, x calculates the volume of 16 inches of a 2 1/2-inch diameter pipe (78.5398 cubic inches). However, by storing the equation, the HP 32sii can "remember" the relationship between diameter, length, and volume--so it can be used many times.
Put the calculator in equation mode and type in the equation using the following keystrokes:
 Keys Display Description Press RS, then EQN EQN LIST TOP or the current equation Selects Equation mode, shown by the EQN annunciator. Press RCL "_" Begins a new equation, turning on the equation-entry cursor. RCL turns in the A...Z annunciator so a variable name can be entered. Press V, RS, then [=] V = "_" RCL, V types V and moves the cursor to the right. Press [.] 2, then 5 V = 0.25_ Digit entry uses the "_" digit-entry cursor Press x, RS, pi, then x V = 0.25 x pi x "_" x ends the number and restores the "_" Press RCL, D, yx, then 2 = 0.25 x pi x D ^ 2 "_" yx types ^. Press x, RCL, then L 0.25 x pi x D^2 x L "_" V = scrolls off the left side of the display Press ENTER v = 0.25xpixD^2x Terminates and displays the equation. The right arrow shows that part of the equation does not fit in the display, and the symbol above SUM+ means press SUM+ to see characters in that direction. Hold RS and SHOW CK = 5836 026.0 Shows the checksum and length for that equation, so keystrokes can be checked.
By comparing the checksum and length of the equation with those in the example, it can be verified that the equation has been entered properly.
Evaluate the equation (to calculate V):
 Keys Display Description Press ENTER D? value Prompts for variables on the right-hand side of the equation. Prompts for D first; value is the current value of D Press 2, [.]. 1, [.]. then 2 D? 2 1/2_ Enters 2 1/2 inches as a fraction Press R/S L? value Stores D, prompts for L; value is current value of L Press 16, then R/S v = 78.5398 Stores L; calculates V in cubic inches and stores the result in V

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