E fx-82AU PLUS User’s Guide CASIO Worldwide Education Website http://edu.casio.com CASIO EDUCATIONAL FORUM http://edu.casio.
Contents Important Information ............................................................. 2 Sample Operations .................................................................. 2 Initializing the Calculator ........................................................ 2 Safety Precautions .................................................................. 2 Handling Precautions.............................................................. 2 Removing the Hard Case ...............................................
Important Information • The displays and illustrations (such as key markings) shown in this User’s Guide are for illustrative purposes only, and may differ somewhat from the actual items they represent. • The contents of this manual are subject to change without notice. • In no event shall CASIO Computer Co., Ltd. be liable to anyone for special, collateral, incidental, or consequential damages in connection with or arising out of the purchase or use of this product and items that come with it.
• Never try to take the calculator apart. • Use a soft, dry cloth to clean the exterior of the calculator. • Whenever discarding the calculator or batteries, be sure to do so in accordance with the laws and regulations in your particular area. * Company and product names used in this manual may be registered trademarks or trademarks of their respective owners.
Reading the Display The display of the calculator shows expressions you input, calculation results, and various indicators. Input expression Indicators Math Math Calculation result • If a indicator appears on the right side of the calculation result, it means the displayed calculation result continues to the right. Use C and B to scroll the calculation result display. • If a E indicator appears on the right side of the input expression, it means the displayed calculation continues to the right.
Important: For some type of calculation that takes a long time to execute, the display may show only the above indicators (without any value) while it performs the calculation internally. Using Menus Some of the calculator’s operations are performed using menus. Pressing or @, for example, will display a menu of applicable functions. The following are the operations you should use to navigate between menus.
Fix Sci Norm Specifies the number of digits for display of a calculation result. Fix: The value you specify (from 0 to 9) controls the number of decimal places for displayed calculation results. Calculation results are rounded off to the specified digit before being displayed. Example: 1 100 ÷ 7 = 14.286 (Fix 3) 14.29 (Fix 2) Sci: The value you specify (from 1 to 10) controls the number of significant digits for displayed calculation results.
*1 Input of the closing parenthesis is required for sin, sinh, and other functions that include parentheses. *2 These multiplication symbols (s) can be omitted. A multiplication symbol can be omitted when it occurs immediately before an opening parenthesis, immediately before sin or other function that includes parentheses, immediately before the Ran# (random number) function, or immediately before a variable (A, B, C, D, M, X, Y), P or e.
th Multiplication, division (s, ÷) 10th Addition, subtraction (+, –) Inputting with Natural Display Selecting Natural Display makes it possible to input and display fractions and certain functions (x2, x3, x9, , , , x−1, 109, e9, Abs) just as they are written in your textbook. 2+' 2 1+' 2 2 2 CC 1 2 Important: • Certain types of expressions can cause the height of a calculation formula to be greater than one display line.
Overwrite Input Mode (Linear Display only) You can select either insert or overwrite as the input mode, but only while Linear Display is selected. In the overwrite mode, text you input replaces the text at the current cursor location. You can toggle between the insert and overwrite modes by performing the operations: &(INS). The cursor appears as “I” in the insert mode and as “ ” in the overwrite mode.
4−3 1 = 1 2 2 4 ( ) 3 C 1 A 2 1 4 3 1 2 1 2 1Y2 Note: • Mixing fractions and decimal values in a calculation while Linear Display is selected will cause the result to be displayed as a decimal value. • Fractions in calculation results are displayed after being reduced to their lowest terms. To switch a calculation result between improper fraction and mixed fraction format: Perform the following key operation: 5( ) To switch a calculation result between fraction and decimal format: Press 5.
3+3:3s3 3 3 (:) 3 3 6 9 Using Engineering Notation A simple key operation transforms a displayed value to engineering notation. Transform the value 1234 to engineering notation, shifting the decimal point to the right. 1234 1234 $ 1.234×103 $ 1234×100 Transform the value 123 to engineering notation, shifting the decimal point to the left. 123 123 $(k) 0.123×103 $(k) 0.
To divide the result of 3 s 4 by 30 1 4 3 (Continuing) 123 + 456 = 579 789 – 579 = 210 (Continuing) 30 123 456 789 Variables (A, B, C, D, X, Y) Your calculator has six preset variables named A, B, C, D, X, and Y. You can assign values to variables and also use the variables in calculations.
Function Calculations For actual operations using each function, see the “Examples” section following the list below. : P is displayed as 3.141592654, but P = 3.14159265358980 is used for internal calculations. e : e is displayed as 2.718281828, but e = 2.71828182845904 is used for internal calculations. sin, cos, tan, sin−1, cos−1, tan−1 : Trigonometric functions. Specify the angle unit before performing calculations. See 1 . sinh, cosh, tanh, sinh−1, cosh−1, tanh−1 : Hyperbolic functions.
Rnd : The argument of this function is made a decimal value and then rounded in accordance with the current number of display digits setting (Norm, Fix, or Sci). With Norm 1 or Norm 2, the argument is rounded off to 10 digits. With Fix and Sci, the argument is rounded off to the specified digit. When Fix 3 is the display digits setting, for example, the result of 10 ÷ 3 is displayed as 3.333, while the calculator maintains a value of 3.33333333333333 (15 digits) internally for calculation.
8 To convert rectangular coordinates (' 2,' 2 ) to polar coordinates B (Pol) 2 C (,) 2 C r=2,θ=45 1 (Pol) 2 (,) 2 r= 2 θ= 45 To convert polar coordinates (' 2 , 45°) to rectangular coordinates B (Rec) 2 C (,) 45 X=1, Y=1 9 (5 + 3) ! = 40320 5 10 |2 – 7| s 2 = 10 1 2 2 40320 3 1 2 2 10 10 (Ran#) 459 48 117 7C 7 11 To obtain three random three-digit integers 1000 (Results shown here are for illustrative purposes only. Actual results will differ.
Paired-variable (X, Y), quadratic regression ( _+CX2) ( y = A + Bx + Cx2) Paired-variable (X, Y), logarithmic regression (ln X) ( y = A + Blnx) Paired-variable (X, Y), e exponential regression ( y = AeBx) (e^X) Paired-variable (X, Y), ab exponential regression (A•B^X) ( y = ABx) Paired-variable (X, Y), power regression ( y = AxB) (A•X^B) Paired-variable (X, Y), inverse regression (1/X) ( y = A + B/x) Pressing any of the above keys ( to ) displays the Stat Editor.
To delete a line: In the Stat Editor, move the cursor to the line that you want to delete and then press &. To insert a line: In the Stat Editor, move the cursor to the location where you want to insert the line and then perform the following key operation: (STAT) (Edit) (Ins). To delete all Stat Editor contents: In the Stat Editor, perform the following key operation: (STAT) (Edit) (Del-A).
3 To calculate the linear regression and logarithmic regression correlation coefficients for the following paired-variable data and determine the regression formula for the strongest correlation: (x, y) = (20, 3150), (110, 7310), (200, 8800), (290, 9310). Specify Fix 3 (three decimal places) for results.
Number of Digits for Internal Calculation Precision 15 digits In general, p1 at the 10th digit for a single calculation. Precision for exponential display is p1 at the least significant digit. Errors are cumulative in the case of consecutive calculations. Function Calculation Input Ranges and Precision Functions sinx cosx tanx sin–1x cos–1x Input Range DEG 0 \x\ 9 s 109 RAD 0 \x\ 157079632.7 GRA 0 \x\ 1 s 1010 DEG 0 \x\ 9 s 109 RAD 0 \x\ 157079632.
Rec(r, θ) °’ ” xy x y ' 0 r 9.999999999 s 1099 θ: Same as sinx \a\, b, c 1 s 10100 0 b, c The display seconds value is subject to an error of 21 at the second decimal place.
C (or B) B1 Clearing the Error Message While an error message is displayed, press to return to the calculation screen. Note that this also clears the calculation that contained the error. Error Messages Math ERROR Cause: • The intermediate or final result of the calculation you are performing exceeds the allowable calculation range. • Your input exceeds the allowable input range (particularly when using functions).
For details about initialized settings, see “Configuring the Calculator Setup”. 4. Initialize all modes and settings by performing the following operation: (CLR) (Setup) (Yes). Replacing the Battery A low battery is indicated by a dim display, even if contrast is adjusted, or by failure of figures to appear on the display immediately after you turn on the calculator. If this happens, replace the battery with a new one.
Independent Memory: Use this memory to totalize the results of multiple calculations. Variables: This memory is helpful when you need to uses the same value multiple times in one or more calculations. I What is the key operation to take me from the STAT Mode to a mode where I can perform arithmetic calculations? Press (COMP).
