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Instructions of use
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Basic operation
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Using the keyboard, enter an expression with the usual operators + - * /, then click the compute button, in the bottom of the worksheet. For very large or very small numbers, use the E notation: 1.6E-19.
The result prints in a new line. You can leave it here: Calculator always computes the latest expression in the worksheet, skipping the lines which contain only a previous result. So you can write another expression in a new line, or you can change the first expression and compute it again.
If you connect as a registered user, the whole content of your worksheet will be saved, enabling you to retrieve it next time, wherever you get connected from.
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The special symbols: % = ° (percent, equal, degree)
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The % sign works like in the normal language: for instance 2000 + 12% is 2240, while 2000 * 12% is 240.
Calculator is a scientific calculator, it includes trigonometric functions. Normally you provide a trigonometric function with an angle in radians for instance sin (pi/6) (for π, write pi.) Calculator also supports angles in degrees: append ° after the value of the angle, for instance write sin (30°).
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The scientific features
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The hat ^ is the symbol for exponientation, for instance 3 ^ 2.
The minus sign - is also the unary negation operator. The unary negation works like 0 - ... so its precedence is the precedence of subtraction: for instance, - 2 ^ 2 is - 4.
Calculator supports the following functions:
abs,
arccos,
arccosh,
arcsin,
arcsinh,
arctan2 ,
arctan,
arctanh ,
ceil,
cos,
cosh,
div ,
erf,
erfc,
exp,
floor,
gamma,
hypot ,
lgamma ,
log10,
log,
mod,
sin,
sinh,
sqr,
sqrt,
tan,
tanh,
trunc.
The syntax is the same for all the functions, you enclose the argument between parentheses like in arccosh(sin(pi/6)).
arctan2 and hypot take two arguments: arctan2(y, x) returns the angle of a (x,y) vector, hypot(x,y) returns the square root of x2 + y2.
mod and div use a different convention: 365.24 mod 7, 365.24 div 7.
abs supports the bar notation: |-3| is like abs(-3).
With the resize button you can select another view for Calculator, where the page displays a keyboard with all the functions. Clicking a key in that keyboard adds the corresponding text to the end of the worksheet.
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Storing values in Calculator's memory
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If you connect as a registered user, you can save values for future use.
To have Calculator store a value under a given name, write that name followed by the equal sign = before the value to store, then click compute:
golden = (1 + sqrt(5))/2
The name may be any unused sequence of unaccented Roman characters or digits not starting with a digit. Later you can use the name in any expression: 10 * golden - 1. For instance if you are a physicist you may want to define once for all hbar = 1.05457148E-34, if you are working in Europe with USA you may want to define once for all mmperinch = 25.4.
The names do not care about the case: you can write MMPerInch to recall the value that you stored as mmperinch.
Storing data at costs money (little money: less than $0.00001 a month for one value), and storing too many constants may make their list too long. You can remove constants from your storage in Your constants.
The list of the constants currently stored is below. Use the append button to add a constant's name to the worksheet. Use the delete button to remove definitely a constant from your storage area.
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