Question
The number of values of $x$, where the function $f(x)=$ $\cos x+\cos (\sqrt{2} x)$ attains its maximum, is(A) 0(B) 1(C) 2(D) infinite
Step 1
Step 1: The maximum value of $\cos x$ is 1, which occurs when $x = 0$ or $x = 2\pi$. Show more…
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