2 Times Pi Times 4
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Working with Multiples of pi/6, pi/4, and pi/3 - YouTube
How to use pi to compute area and circumference Working with multiples of pi/6, pi/4, and pi/3 Compare cosine(pi/2+x),sin(pi/2+x),cos(pi+x),sin(pi+x) with sinx and
2 pi or not 2 pi?—wolfram blog
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Pi multiples0606 multiples of pi/6 and pi/4 Pi wolfram mathworldPi -- from wolfram mathworld.
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![Trigonometric Values For Pi](https://i.ytimg.com/vi/M6QQPQMxOXM/maxresdefault.jpg)
![Working with Multiples of pi/6, pi/4, and pi/3 - YouTube](https://i.ytimg.com/vi/ovdCEQz2Rwg/maxresdefault.jpg)
![Compare cosine(pi/2+x),sin(pi/2+x),cos(pi+x),sin(pi+x) with sinx and](https://i2.wp.com/www.geogebra.org/resource/gtxfysdm/iSQtJOw55ZVy13Px/material-gtxfysdm.png)
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