The exact **value** of cos(**225**°) is -√(2) / 2.

**Click to explore further. Also asked, what is the exact value of cos 225?**

The **exact value of cos**(**225**°) is -√(2) / 2.

Similarly, how do you find the value of SEC? **1 Answer**

Besides, what is the exact value of sin 255 degrees?

## How do you find COS 240?

- 60∘ is an angle of one of the standard triangles with. cos(60∘)=12.
- 240∘ is in the 3rd quadrant so (either by CAST or noting that the “x-side” of the associate triangle is negative) cos(240∘)=−cos(60∘)
- cos(240∘)=−12.

How do you find the value of cos 270?

If this is the case, then at 90 degrees, we will intersect the unit circle at the point (0,1), and at **270** degrees we will be at (0,−1) . Given that, we can easily **find** the sine and **cosine**: sin(**270**o)=−1,**cos**(**270**o)=0,tan(**270**o)=−10= undefined.

### What is COS 120 in radians?

θ° | θ^{radians} | cos(θ) |
---|---|---|

120° | 2π/3 | -1/2 |

135° | 3π/4 | -√2/2 |

150° | 5π/6 | -√3/2 |

180° | π | -1 |

### What is the exact value of cos 315 degrees?

θ° | θ^{radians} | cos(θ) |
---|---|---|

240° | 4π/3 | -1/2 |

270° | 3π/2 | |

300° | 5π/3 | 1/2 |

315° | 7π/4 | √2/2 |

### What is the exact value of sin 210?

The angle POQ is 30° and is called the related angle for **210**°. and **sin 210**° = −**sin** 30° = − . tan **210**° = tan 30° = − . In general, if lies in the third quadrant, the acute angle θ − 180° is called the related angle for θ.

### What is the sin of 45 in radical form?

Term sin of 60 degrees | Definition radical 3 / 2 |
---|---|

Term sin of 45 degrees | Definition radical 2 / 2 |

Term cos of 45 degrees | Definition radical 2 / 2 |

Term tan of 45 degrees | Definition 1 |

Term cot of 45 degrees | Definition 1 |

### What is sin270?

270 is an obtuse angle since it is greater than 90° **sin(270**) = -1. In Microsoft Excel or Google Sheets, you write this function as =SIN(RADIANS(270)) Since 270° is less than 90, we can express this in terms of a cofunction.

### What is sin180?

According to the Unit Circle, the coordinates for 180 degrees are (1,0). Sin is the y-coordinate. So **sin 180**= 0. NOTE: I assume that you mean sin of 180 degrees.

### How do you find cos 75?

Answer and Explanation: The value of **cos**(**75**°) is √6−√24 6 − 2 4 . Notice that we can write **75**° as 30° + 45°.

### What is Secant formula?

**Secant**(sec) – Trigonometry function

In a right triangle, the **secant** of an angle is the length of the hypotenuse divided by the length of the adjacent side. In a **formula**, it is abbreviated to just ‘sec’. sec. x. =

### What is secant in terms of sin and cos?

Each of these functions are derived in some way from **sine and cosine**. The tangent of x is defined to be its **sine** divided by its **cosine**: The **secant** of x is 1 divided by the **cosine** of x: **sec** x = 1 **cos** x , and the **cosecant** of x is defined to be 1 divided by the **sine** of x: **csc** x = 1 **sin** x .

### What is the exact value of 5pi 6?

The **exact value of sec**(π**6**) **sec** ( π **6** ) is 2√3 . Multiply 2√3 by √3√3 . Combine and simplify the denominator. Multiply 2√3 2 3 and √3√3 3 3 .

### What is the inverse of cos?

arccos. The arccos function is the inverse of the **cosine** function. It returns the angle whose **cosine** is a given number.