Can we declare a class as protected ??

 If we are thinking about outer class,then we can't declare this class as protected.But we can declare an inner class as protected.
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Is a unit doublet function an even function or odd function?

Dirac’s delta function is defined by the following property  δ(t) = 0 at t !=0            ∞ at t=0. The derivative of an even fu...