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Chapter 6: Q. 13 (page 435)

Find the exact value of the expression. Do not use a calculator.

cos-40掳cos40掳

Short Answer

Expert verified

The exact value of the expressioncos-40掳cos40掳is,1.

Step by step solution

01

Step 1 Given expression is,

cos-40掳cos40掳.

The objective is, we need to find the exact value for the given expression.

02

Step 2 we know that,

cos-胃=cos胃cos-40掳=cos40掳

So, the given expression becomes,

cos-40掳cos40掳=cos40掳cos40掳=1

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