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LINGO offers a number of standard, mathematical functions. These
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Sign -- from Wolfram MathWorld
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Sign function - Wikipedia
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Absolute value graph and function review (article) | Khan Academy
Absolute value - Wikipedia
Why is the integral of 1/x^2 between the limits 1 and -1 equal to -2, despite the graph of y=1/x^2 being strictly positive? - Quora
Help me in drawing log(x) curve - TeX - LaTeX Stack Exchange
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11.12. Sign Function - Graphing Calculator by Mathlab:User Manual
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15.7. Limit of an Absolute Value Function - Graphing Calculator by Mathlab:User Manual
Derivatives of Logaithmic Functions
5. Derivative of the Logarithmic Function
Sign function - Wikipedia
Absolute value - Wikipedia
Sign -- from Wolfram MathWorld
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