Question

Cos 1770what is the value

Answer 1

Answer:

−0.2835176515

Step-by-step explanation:

acoording to my calculator

Answer 2

The value of Cos 1770° = √3/2

Given:

Cos 1770°

To find:

The value of Cos 1770°

Solution:

Given Cos 1770°  

Here 1770° = 360 × 5 - 30°

⇒ Cos 1770° = Cos (360×5 - 30°)

As we know  Cos (n × 360°- θ) = cos θ  

⇒ Cos (360×5 - 30°) = Cos 30°

From trigonometric values table

          Cos 30° = √3/2

⇒ Cos 1770° = Cos 30° = √3/2

Therefore,

The value of Cos 1770° = √3/2

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