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Chapter 7: Q.5 (page 473)

cos-胃-cos胃

Short Answer

Expert verified

The answer ofcos-胃-cos胃is0

Step by step solution

01

Given information

We are given an equationcos-胃-cos胃

02

Use the properties of even and odd function

We know that cosine is an even function

Hence cos-胃=cos胃

And therefore

cos-胃-cos胃cos胃-cos胃=0

03

Conclusion

The value ofcos-胃-cos胃is0

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