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Chapter 6: Q. 18 (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.

sec420鈭�鈥�

Short Answer

Expert verified

The exact value is2.

Step by step solution

01

Step 1. Given information.     

We have:

sec420鈭�鈥�

02

Step 2. Find the exact value of trigonometric function.      

The function is sec420鈭�鈥�.

Formula used:

sec胃+2蟺=sec胃

Here, 胃=60掳

It follows:

sec60掳+360掳=sec60掳=1cos60鈭�鈥�=112=2

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