The adjacent side of angle a is called the cosine of ∠A, which is called cos A, that is, cos A = the adjacent/hypotenuse of angle a (right triangle). Denoted as cos A = x/r.
The definition domain of cosine function is the whole set of real numbers, and the range is [-1,1].
It is a periodic function with a minimum positive period of 2 π. When the independent variable is 2kπ (k is an integer), the function has a maximum value of 1;
When the independent variable is (2k+1)π, the function has a minimum -1. Cosine function is even function and its image is symmetric about y axis.
y=cosine(x)
| X(deg) | X(Rad) | Y=cosine(X) |
| 180 ̊ | π | -1 |
| 150 ̊ | 5π/6 | -0.866025 |
| 135 ̊ | 3π/4 | -0.707107 |
| 120 ̊ | 2π/3 | -0.5 |
| 90 ̊ | π/2 | 0 |
| 60 ̊ | π/3 | 0.5 |
| 45 ̊ | π/4 | 0.707107 |
| 30 ̊ | π/6 | 0.866025 |
| 0 ̊ | 0 | 1 |
x：30 radian
Click "calculate" to output the result
Cotangent (x)：0.866025
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