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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