Dy/dx represents the derivative of y, that is, f'(x)=dy/dx.

And your d2y/dx2 is actually D 2.

Y/dx 2, which is the second derivative of y.

Then d n

Y/dx n means that y is differentiated n times.

Where d/dx represents the derivative operation of a term.

For example: y=sin

x

therefore

dy/dx=cos

x

d^2

y/dx^2=-sin

x

d^3

y/dx^3=-cos

x