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This function graph drawing program offers a wide range of user interface and input options. It appears complex at first, and indeed is if you want to fully utilize its capabilities. See the long manual for details. However, the most important basic functions are fairly easy to understand, at least if you have sufficient prior mathematical knowledge.
Up to three graphs can be drawn, and there are three input fields for algebraic formulas. These are the longest input fields in the top left. The first of these three fields already contains the formula for the normal parabola, x^2. Change this if necessary. ^ stands for power. Basic arithmetic operations should be clear; parentheses and trigonometric functions with the usual abbreviations, as well as a variety of other functions, are available. The most important ones are sqr() for square root and ln() for natural logarithm, log10() for the base ten logarithm, and logn() for the general logarithm, e.g., logn(2#x) for base 2. # is a separator within functions, since commas and points can both be used as decimal separators. The most important constants are e and pi. When in doubt, it's better to use too many parentheses than too few. The derivative and integral are determined numerically; for the integral, you still have to find the correct value at +C if the curve to be integrated does not start at 0. These are the most important functions, which already give a lot of possibilities.
For visualisation, the easiest is to change colors to either the predefined ones or custom colors. The graph thickness shouldn't cause any problems either. Other size changes should be coordinated, especially width and height, value range, intervals, reticule lines and dashes. The quadrant buttons below the graph allow you to quickly switch between quadrants. The size information there only takes effect when you click one of the quadrant buttons. The arrows and multiplication buttons to the left of the graph allow you to move the values or to zoom.