3. 特殊角的三角函数值
|
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| |
| 度 | 弧度 | ||||||
| 0 |
| 0 | 1 | 0 |
| 1 |
|
| 15 |
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|
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|
|
| 18 |
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|
|
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| |
| 度 | 弧度 | ||||||
| 22.5 |
|
|
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|
|
|
|
| 30 |
|
|
|
|
|
| 2 |
| 36 |
|
|
|
|
|
|
|
| 45 |
|
|
| 1 | 1 |
|
|
| 54 |
|
|
|
|
|
|
|
| 60 |
|
|
|
|
| 2 |
|
| 67.5 |
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|
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|
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|
|
| 72 |
|
|
|
|
|
|
|
| 75 |
|
|
|
|
|
|
|
| 90 |
| 1 | 0 |
| 0 |
| 1 |
| 120 |
|
|
|
|
|
|
|
| 135 |
|
|
|
|
|
|
|
| 150 |
|
|
|
|
|
| 2 |
| 180 |
| 0 |
| 0 |
|
|
|
表中
表示
，（即左、右极限）.一个锐角的余角的三角函数值等于这个角的余三角函数值，例如
，
，
.