If you have any questions or ideas for improvements to the Derivative Calculator, don't hesitate to write me an e-mail. The gesture control is implemented using Hammer.js. poles) are detected and treated specially. For each function to be graphed, the calculator creates a JavaScript function, which is then evaluated in small steps in order to draw the graph. The interactive function graphs are computed in the browser and displayed within a canvas element (HTML5). Otherwise, a probabilistic algorithm is applied that evaluates and compares both functions at randomly chosen places. If it can be shown that the difference simplifies to zero, the task is solved. For example, this involves writing trigonometric/hyperbolic functions in their exponential forms. Their difference is computed and simplified as far as possible using Maxima. The "Check answer" feature has to solve the difficult task of determining whether two mathematical expressions are equivalent. For each calculated derivative, the LaTeX representations of the resulting mathematical expressions are tagged in the HTML code so that highlighting is possible. This, and general simplifications, is done by Maxima. For example, constant factors are pulled out of differentiation operations and sums are split up (sum rule). In each calculation step, one differentiation operation is carried out or rewritten. There is also a table of derivative functions for the trigonometric functions and the square root, logarithm and exponential function. The rules of differentiation (product rule, quotient rule, chain rule, …) have been implemented in JavaScript code. Instead, the derivatives have to be calculated manually step by step. Maxima's output is transformed to LaTeX again and is then presented to the user.ĭisplaying the steps of calculation is a bit more involved, because the Derivative Calculator can't completely depend on Maxima for this task. Like any computer algebra system, it applies a number of rules to simplify the function and calculate the derivatives according to the commonly known differentiation rules. Maxima takes care of actually computing the derivative of the mathematical function. This time, the function gets transformed into a form that can be understood by the computer algebra system Maxima. When the "Go!" button is clicked, the Derivative Calculator sends the mathematical function and the settings (differentiation variable and order) to the server, where it is analyzed again. MathJax takes care of displaying it in the browser. This allows for quick feedback while typing by transforming the tree into LaTeX code. After you create a formula, you can copy it. Or use the AutoSum feature to quickly total a series of values without entering them manually in a formula. The parser is implemented in JavaScript, based on the Shunting-yard algorithm, and can run directly in the browser. Instead of using a calculator, use Microsoft Excel to do the math You can enter simple formulas to add, divide, multiply, and subtract two or more numeric values. The Derivative Calculator has to detect these cases and insert the multiplication sign. A specialty in mathematical expressions is that the multiplication sign can be left out sometimes, for example we write "5x" instead of "5*x". In doing this, the Derivative Calculator has to respect the order of operations. It transforms it into a form that is better understandable by a computer, namely a tree (see figure below). The Smarter Balanced Desmos calculators is also compliant with the latest web accessibility standards.For those with a technical background, the following section explains how the Derivative Calculator works.įirst, a parser analyzes the mathematical function. The calculators allow students to adjust font size if they prefer larger print. The calculators provide support for students who have low vision or students who have difficulty with visual perceptual skills. Paired with a refreshable braille display, these features offer students who use braille the same opportunity as their peers to access an online calculator. Fully supporting keyboard navigation, the calculators communicate with screen readers, which voice additional cues to indicate a student’s location within an expression or within a graph (numerator or denominator, superscript or subscript, baseline, points on the graph, etc.). Students can then emboss their graphs and share print or braille versions with classmates and teachers. The pitch of the tone increases or decreases depending on the shape of the wave or graph. Students who are blind can create their own graphs in real time and determine the shape of a graph through audio trace. Students who are blind can read and write equations using the two mathematical braille codes used in the United States: Nemeth and Unified English Braille (UEB).
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