Solution Found!
In Exercises 2536, evaluate without using a calculator by
Chapter 4, Problem 4.1.1.207(choose chapter or problem)
QUESTION:
In Exercises 25–36, evaluate without using a calculator by using ratios in a reference triangle.
\(\cos 120^{\circ}\)
Questions & Answers
QUESTION:
In Exercises 25–36, evaluate without using a calculator by using ratios in a reference triangle.
\(\cos 120^{\circ}\)
ANSWER:Step 1 of 2
The given angle is .
At first, we will sketch the angle on the co-ordinate axis.
Then we will label a reference angle obtained by subtracting or adding the given angle with the multiples of . So that we can build a reference triangle whose base lies on the -axis.