App description

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)

<table class="pure-table"> <tbody> <tr> <td>X(deg)</td> <td>X(Rad)</td> <td>Y=cosine(X)</td> </tr> <tr> <td>180 ̊</td> <td>π</td> <td>-1</td> </tr> <tr> <td>150 ̊</td> <td>5π/6</td> <td> -0.866025</td> </tr> <tr> <td>135 ̊</td> <td>3π/4</td> <td>-0.707107</td> </tr> <tr> <td>120 ̊</td> <td>2π/3</td> <td>-0.5</td> </tr> <tr> <td>90 ̊</td> <td>π/2</td> <td>0</td> </tr> <tr> <td>60 ̊</td> <td>π/3</td> <td>0.5</td> </tr> <tr> <td>45 ̊</td> <td>π/4</td> <td>0.707107</td> </tr> <tr> <td>30 ̊</td> <td>π/6</td> <td>0.866025</td> </tr> <tr> <td>0 ̊</td> <td>0</td> <td>1</td> </tr> </tbody> </table>

Usage example

x：30 radian

Click "calculate" to output the result

Cotangent (x)：0.866025