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www.johndcook.com
| | www.mathplanet.com
6.5 parsecs away

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| | revisionmaths.com
8.1 parsecs away

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| | Trigonometry GCSE Maths Revision section covering: Sin, Cos, Tan, Pythagoras, Sine and Cosine Rule, Similar Triangles and Congruency.
| | www.oranlooney.com
10.9 parsecs away

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| | One thing you may have noticed about the trigonometric functions sine and cosine is that they seem to have no agreed upon definition. Or rather, different authors choose different definitions as the starting point, mainly based on convenience. This isn't problematic or even particularly unusual in mathematics - as long as we can derive any of the other forms from any starting point, it makes little theoretical difference which we start from since they're all equivalent anyway.
| | fabricebaudoin.blog
67.6 parsecs away

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| Here are the lecture notes of the minicourse given at NYU Abu Dhabi. DirichletDownload