In Exercises 510, find the exact value.cos 12p/32

Chapter 4, Problem 4.1.1.558

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QUESTION:

In Exercises 5–10, find the exact value.

\(\cos\ (2 \pi / 3)\)

Questions & Answers

QUESTION:

In Exercises 5–10, find the exact value.

\(\cos\ (2 \pi / 3)\)

ANSWER:

Step 1 of 4

The given angle is   

At first we will sketch the angle on the coordinate axis.

Then we will label a reference angle which can 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.

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