ddy is an operator which takes a function as its input and returns its derivate or instantaneous rate of change with respect to x.

ddy is an operator which takes a function as its input and returns its

1.	ddy is an operator which takes a function as its input and returns its derivate or instantaneous rate of change with respect to x.
Answer» $\frac{d}{d y}$ is an operator which takes a function as its input and returns its derivate or instantaneous rate of change with respect to x.