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http://www.calculator-tab.com/
User guide:
Quick start
Features
Using the memory function
Negative numbers
Functions with one (x) value
Functions with two (x and y) values
Percentages
Options
Keyboard shortcuts
List of functions:
Plus / minus
Multiplication / division
Square root
Root (general)
Square
Exponent (general)
Logarithm (base 10)
Natural logarithm (base e)
e (constant)
Reciprocal
Sine / cosine
Arcsine / arccosine
Tangent / arctangent
Pi (constant)
Modulo
Scientific notation
Toggle positive / negative
Brackets
Percentage
Ceiling
Floor
Decimal
Factorial
table of contents calculator
Quick start
Calculator Tab is a free online scientific calculator which works like your regular calculator. One feature that sets it appart from other calculators is that it's memory bank can store an unlimited amount of numbers and descriptions of these numbers for an indefinite length of time. The stored numbers can be sorted by date, by the number of uses or by name. Your saved numbers and their respective descriptions are saved directly on your computer, never entering the sphere of the internet, so that they are as secure as your workstation.
This calculator follows the standard order of operations. It can handle values from 4.9e-324 to 1.7e+308. To perform a calculation, press the calculator buttons with the mouse as you would write the symbols of the calculation. For example to calculate 2 + 5 * 8 press the buttons . To see the result (which in this case will be 42) and to terminate the calculation press the button. The exception to this approach is when using mathematical functions which only take one value: in these functions, the value always comes before the function. For more details see the section "Functions with one (x) value" below. To be able to use your keyboard instead of the mouse, you must first click anywhere on the calculator with the mouse.