The number of values of x where the function \[f(x)=\cos x+\cos (\sqrt{2}x)\] attains its maximum is [IIT 1998; DCE 2001, 05]

The number of values of x where the function \[f(x)=\cos x+\cos (\sqrt

1.	The number of values of x where the function \[f(x)=\cos x+\cos (\sqrt{2}x)\] attains its maximum is [IIT 1998; DCE 2001, 05]
A.	0
B.	1
C.	2
D.	Infinite
Answer» C. 2

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The number of values of x where the function \[f(x)=\cos x+\cos (\sqrt{2}x)\] attains its maximum is [IIT 1998; DCE 2001, 05]

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