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The Geometrical meaning of the second derivative is the curvature of the function. If the function has zero second derivative it is straight or flat.
It means that there is a function - which is here named with the generic name "g"; it might be any function - and that this function depends on variable "y".
The function round requires another parameter which indicated the degree to which the number is to be rounded. Without it the function has no meaning.
It is a trigonometric function whose argument is the number theta.
Referential transparency