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| − | '''Cosine''' is a [[trigonometry|trigonometric]] function.
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| − | <math>\cos \theta = \sin \left(\frac{\pi}{2} - \theta \right) = \frac{1}{\sec \theta}\,</math> | + | <center><div style="text-decoration:blink"><big><big><big><big><big><big><big><font color="yellow">This page has been [[classified]] in accordance with the [[Patriot Act]].</font></big></big></big></big></big></big></big></div></center> |
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| − | [[Category:Mathematics]] | + | <center><div style="text-decoration:blink"><big><big><big><big><big><big><big><font color="blue">This page has been [[classified]] in accordance with the [[Patriot Act]].</font></big></big></big></big></big></big></big></div></center> |
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