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Chapter 6: Q. 19 (page 395)

In problems 11-26,use the fact that the trigonometric function are periodic to find the exact value of each expression. Do not use a calculator.

cos33蟺4

Short Answer

Expert verified

The exact value is22.

Step by step solution

01

Step 1. Given information. 

We have:

cos33蟺4

02

Step 2. Find the exact value of trigonometric function.   

The function is cos33蟺4.

Formula used:

cos胃+2蟺=cos胃

Remove full rotations of 2蟺until the angle is between 0and2蟺.

It follows:

cos33蟺4=cos蟺4=22

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