Unit and dimension

Why eat is dimensionless / zero?

@Indranil exponential or trigonometric terms are dimensionless.....here the unit of a becomes second inverse...so at us unitless

@SanketBiradar said in Unit and dimension:
@Indranil exponential trigonometric terms are dimensionless.....here the unit of a becomes second inverse...so at us unitless
It would be usefull if you explain what exponential trigonometric term is here?