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Towards Maclaurin

Build series for the sine and cosine functions by adding one term at a time, alternately making the approximation too big then too small but getting ever closer.

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Taking Trigonometry Series-ly

Look at the advanced way of viewing sin and cos through their power series.

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Bessel's Equation

Get further into power series using the fascinating Bessel's equation.

What Do Functions Do for Tiny X?

Stage: 5 Challenge Level: Challenge Level:2 Challenge Level:2

You may like to use the example spreadsheet.

Visually what do you notice when you increase the magnification on the origin?