The result is valid only from -pi/2 to pi/2. The Inverse Sine (ASIN or ARCSIN) function is used by clicking on the "ASIN" button or type "ASIN()". The result is the ratio of the length of the opposite side to the length of the hypotenuse of a right triangle. The Sine (SIN) function is used by clicking on the "SIN" button or type "SIN()". PI is a mathematical constant of the ratio of a circle's circumference to its diameter. The Factorial function is used by clicking the "!" button or type "!". To do this enter the mantissa (the non exponent part) then press "EEX" or type"e" and then enter the exponent. To enter a number in this format use the exponent key "EEX". Numbers are automatically displayed in the format when the number is too large or too small for the display. Numbers with exponents of 10 are displayed with an "e", for example 4.5e+100 or 4.5e-100. This function is the same as x^-1 or dividing 1 by the number. Multiplicative inverse (reciprocal function) is used by pressing the "1/x" button or typing "inv()". The Natural logarithm (LN) is used by clicking on the "LN" button or type "LN()". The logarithm (LOG) is used by clicking on the "LOG" button or type "LOG()". The natural exponential (e raised to the x) is used by clicking on the "e^x" button or type "exp()". The raise to the power (y raised to the x function) is used by clicking on the "y^x" button or type "^". This function represents x^.5 where the result squared is equal to x. The square root function is used by clicking on the "x" button or type "sqrt()". The square function is used by clicking on the "x^2" button or type "^2". The sign key (negative key) is used by clicking on the "(-)" button. The division (divide function) is used by clicking on the "/" button or using the keyboard "/" key. The multiplication (times function) is used by clicking on the "x" button or using the keyboard "*" key. The subtraction (minus function) is used by clicking on the "-" button or using the keyboard. The addition (sum function) is used by clicking on the "+" button or using the keyboard. Some of these features include: Unit Converter, Constants Library, Equation solver, Polynomial Solver, Base Conversion, and Decimal to Fraction Conversion. The pallet provides a display area for special features. The calculator is divided into two sections the scientific calculator interface on the left and the calculator pallet on the right. Values in the stack can also be "popped" down into the input field of the calculator by clicking on the down arrows to the left of the line in the stack. The stack displays only 4 items at once, but one can scroll up and down the stack by clicking on the up and down arrow above the stack. The stack is a feature of the calculator that provides a way to view a history of results. The user is given the option to use either input method and both are equally valid however, there are some trigonometric function (as noted below) that are limited to computer keyboard entry only since there is a limited amount of space available for graphical button placements. The online calculator supports data entry through either a graphical button or through the use of traditional computer keyboard keys. Expressions that contain parenthesis, such as "(1+2)*3", are evaluated by noting the precedence order and entering the form as "1 2 + 3 *". For example, to evaluate the expression "1 + 2" in RPN, the user is required to enter "1 2 +" and the expression is evaluated immediately after the operator. RPN Mode RPN, which stands for Reverse Polish notation, is a stack-based notation where operators are designed to follow their operands. Expressions entered in algebraic input mode are done in a manner that closely resembles the natural form of the expression and the order of the operations is determined by operator precedence and parenthesis. The calculator mode is set by clicking on the "ALG/RPN" symbol in the status bar or by changing the mode inside the menu dialog box.Īlgebraic input mode is commonly referred to as "infix notation" and is widely used by most handheld calculators. The online calculator operates in either algebraic input (default mode) or RPN input. eCalc is offered as both a free online calculator and as a downloadable calculator. Inverse Cotangent Online Hyperbolic Trigonometric FunctionsĬoordinate System Decimal To Fraction Complex Numbers Online Unit Converter Constants Library Online Solver Base ConverterĮCalc is a free and easy to use scientific calculator that supports many advanced features including unit conversion, equation solving, and even complex-number math. Windows Version Mac OSX Version View More Downloads
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