What would you need these for? Well when you're dealing with angles, you often need to calculate the length of the side of a triangle. Suppose your robot drives 1m forward, turns 23 degrees and then travels another 0.75m forward. How far are you from the start? That's where these blocks come in handy! I won't go into the math in this post but you get the idea. (wikipedia)
http://www.hitechnic.com/blog/uncategorized/new-hitechnic-blocks-for-sin-cos-and-atan2/
via - I'd rather be building robots
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Damien Kee
www.damienkee.com
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