Let \[f(x)=\cos px+\sin x\] be periodic, then p must be

1.	Let \[f(x)=\cos px+\sin x\] be periodic, then p must be
A.	Rational
B.	Irrational
C.	Positive real number
D.	None of these
Answer» B. Irrational

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Let \[f(x)=\cos px+\sin x\] be periodic, then p must be

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