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Chapter 7: Q. 92 (page 496)

In Problems 79-90, find the exact value of each expression.

f(x)=cos(2x)+cosx

Short Answer

Expert verified

The real zeroes are蟺,蟺3,5蟺3

Step by step solution

01

Given information

Given functionf(x)=cos(2x)+cosx

02

Rearranging and calculating the value

Rearranging, we get

f(x)=cos(2x)+cosxf(x)=2cos2x-1+cosx(cosx+1)(2cosx-1)=0cosx=-1cosx=12x=蟺,蟺3,5蟺3

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