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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