Answer: In Exercises 2536, evaluate without using a

Chapter 4, Problem 4.1.1.216

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QUESTION:

In Exercises 25–36, evaluate without using a calculator by using ratios in a reference triangle.

\(\cos \frac{17\pi}{4}\)

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QUESTION:

In Exercises 25–36, evaluate without using a calculator by using ratios in a reference triangle.

\(\cos \frac{17\pi}{4}\)

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.

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