Difference between revisions of "Cosine"
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(Note that this category WILL exist in a few minutes.) |
BRichtigen (talk | contribs) (Cosine Graph) |
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<math>\cos \theta = \sin \left(\frac{\pi}{2} - \theta \right) = \frac{1}{\sec \theta}\,</math> | <math>\cos \theta = \sin \left(\frac{\pi}{2} - \theta \right) = \frac{1}{\sec \theta}\,</math> | ||
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| + | ==Cosine Graph== | ||
| + | The basic cosine graph is as follow: | ||
| + | {| style="background:none" | ||
| + | | | ||
| + | {| class="wikitable" style="text-align:center" | ||
| + | |- | ||
| + | !x values | ||
| + | !y values | ||
| + | |- | ||
| + | |width="50%"|0 | ||
| + | |width="50%"|1 | ||
| + | |- | ||
| + | |π/2 | ||
| + | |0 | ||
| + | |- | ||
| + | |π | ||
| + | | -1 | ||
| + | |- | ||
| + | |3π/2 | ||
| + | | 0 | ||
| + | |- | ||
| + | |2π | ||
| + | |1 | ||
| + | |} | ||
| + | |[[Image:Cosine-pi.jpg|350px]] | ||
| + | |} | ||
| + | That would be a full period of the graph - as 2π [[radians]] is equivalent to one circle. The graph continues in that pattern. | ||
[[Category:Trigonometry]] | [[Category:Trigonometry]] | ||
Revision as of 19:12, December 7, 2008
Cosine is a trigonometric function describing the ratio of the adjacent side to the hypotenuse in a right triangle. It is often abbreviated cos.
<math>\cos \theta = \sin \left(\frac{\pi}{2} - \theta \right) = \frac{1}{\sec \theta}\,</math>
Cosine Graph
The basic cosine graph is as follow:
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|
That would be a full period of the graph - as 2π radians is equivalent to one circle. The graph continues in that pattern.