Alex Tabarrok points to a new paper this morning that should thrill data nerds and chart enthusiasts everywhere. Steven Piantadosi of the University of Rochester has produced a simple equation ...

How to Use Trig Functions in Excel. Excel has built-in functions for sine and cosine, the two core trigonometric functions, and for hyperbolic sine and hyperbolic cosine, their hyperbolic ...

Trigonometric skills Working with the graphs of trigonometric functions Trigonometric graphs can be sketched when you know the amplitude, period, phase and maximum and minimum turning points.