If f(x)=\text{\cos}^2x+\text{\cos}^{2}2x+\text{\cos}^{2}3x, then the number of values of x\in[0,2\pi] for which f(x)=1 is

TS EAMCET 2016 Code A Solved Paper

Section: Mathematics

Question : 23 of 160

Marks: +1, -0

If f(x)=cos2x+cos22x+cos23x, then the number of values of x∈[0,2π] for which f(x)=1 is

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