Question

Let \(f(x)=\sin x+\cos a x\) be periodic function. Then
(A) 'a' is any real number
(B) 'a' is any irrational number
(C) 'a' is rational number
(D) \(\mathrm{a}=0\)

Answer 1

Ans : (C) Hint : LCM of rational multiple of same irrational is defined

Answer 2

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Answer 3

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