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Chapter 6: Q 135 (page 397)

Explain how to find the value of cos(-45o)using even鈥搊dd

properties.

Short Answer

Expert verified

The value of cos-45ois :-

12

Step by step solution

01

Step 1. Given Information

We have to find the value of cos-45o.

We will use odd-even properties of cosine function to find the value of cos-45o.

02

Step 2. To find the value 

We have to find the value of cos(-45o).

We know that cosine function is an even function.

That is :-

cos(-胃)=cos胃.

By using this property of cosine function we have :-

cos(-45o)=cos45o.

We know that the value of cos45o=12.

By putting this value, we have :-

cos(-45o)=12.

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