This is for my homies in maths class. I know many of you fear the **sin** & **cos**.

They’re just a way to **convert** from **circular coordinates** to **square coordinates**.

You want to get to the red dot. **If you’re at sea** you set your bearing **θ** and sail straight there. **If you’re in the city** you walk north and then east.

**Cosine** tells you how far you have to walk **crosstown**; **sine** is how far **uptown**.

That’s basically it. If you think uptown and crosstown look like legs of a right triangle, you’re thinking along the right track to understand where the many sin & cos formulæ come from.

Here’s a GPL’ed picture of why we think of cosine as a wave:

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Tags: as the crow flies, cosine, education, Euclidean distance, math, mathematics, maths, Navy coordinates, polar coordinates, projection, Pythagorean metric, rectangular coordinates, sine, taxicab metric, trigonometry

This entry was posted on October 28, 2010 at 6:13 pm and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed.
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