## What fraction is cos 30?

Cos 30 degrees is written as cos 30° and has a value in fraction form as √3/2. Cos 30° = √3/2. Cos 30° = √3/2 is an irrational number and equals to 0.8660254037 (decimal form). Therefore, the exact value of cos 30 degrees is written as 0.8660 approx.

**What is the half angle formula for cos?**

The half angle formula of cos is cos A/2 = ±√[(1 + cos A)/2].

**What is COS 30 Brainly?**

Cos 30° = √3/2. Therefore, the exact value of cos 30 degrees is written as 0.8660 approx. √3/2 is the value of Cos 30° which is a trigonometric ratio or trigonometric function of a particular angle.

### What is cos degree?

Sines and cosines for special common angles

Degrees | Radians | cosine |
---|---|---|

60° | π/3 | 1/2 |

45° | π/4 | √2 / 2 |

30° | π/6 | √3 / 2 |

0° | 0 | 1 |

**How to solve half angle problems?**

– Draw a triangle to represent the given information. – Determine the correct half-angle formula. – Substitute values into the formula based on the triangle. – Simplify.

**How to solve using half angle formula?**

If cos x = 1/√10 with x in quadrant IV,find sin 2x

## How to evaluate for the half angle of cosine?

Half Angle Formula – Cosine . Using a similar process, with the same substitution of `theta=alpha/2` (so 2θ = α) we subsitute into the identity. cos 2θ = 2cos 2 θ − 1 (see cosine of a double angle)

**How many degrees does half a right angle have?**

Accordingly, we may wonder how many degrees are in a half? There are 180° in a half-turn. In the same vein people ask how many degrees are there in 2 right angle? A right angle is used in many places. There are four right angles in a rectangle (360∘) and in a square too. While, there are two right angles in a triangle (90∘).