Identify the function which represents a periodic motion.
A$e ^{-\omega t}$
B$e ^{{\omega t }}$
C$\log _{ e }(\omega t )$
D$\sin \omega t+\cos \omega t$
NEET 2020, Medium
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D$\sin \omega t+\cos \omega t$
d For periodic function
$f(t)=f(t+T)$
where $T$ is time period of function
$\sin (\omega t+2 \pi)+\cos (\omega t+2 \pi)$
$=\sin \omega t+\cos \omega t$
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