This site provides graphing tools. The GCalc 3 menu has several options for graphing. One nice aspect of this site is that multiple functions can be graphed in different colors on the same screen. Another useful feature is that it is easy to copy and paste or print the graphs that are generated.
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GCalc - Java Online Graphing Calculator
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Step-by-step solutions to odd-numbered problems from dozens of trigonometry textbooks.
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Hotmath
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A discussion of dividing a trig graph into intervals.
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Ask Dr. Math
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A discussion of the values of sine and cosine.
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Ask Dr. Math
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An interactive website that gives a good introduction to the six trigonometric functions.
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themathpage
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Reference for the signs of trig functions in each quadrant with diagram.
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Math Wizz
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A clear explanation, with many examples, of how the parameters (amplitude, frequency, phase shift, and vertical shift) affect the graph of trigonometric functions.
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Library of Math
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