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If f(x)=Cos^(2)x+Cos^(2)2x+Cos^(2)3x the...

If `f(x)=Cos^(2)x+Cos^(2)2x+Cos^(2)3x` then the number of `x epsilon[0,2pi]` for which `f(x)=1` is

A

4

B

6

C

8

D

10

Text Solution

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The correct Answer is:
b
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