Q.

If f(x)=sinx+cosax is a periodic function, then

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a

'a' is a irrational

b

a=0 only

c

'a' is a rational number

d

a has no value.

answer is C.

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Detailed Solution

Period of sinx+cosax=L.C.M of 2π,2π|a|⇒a must be rational. number
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