Question: second derivative in 2d math

There are many ways to enter the second derivative in Maple.  Except for some silly reason I am stuck trying to figure out or find out how to enter it in 2d math form. 

d2    f
---
dx2

Entering it like d^2 (right arrow) f  / (dx^2)  is not the right way to enter it.  What is the right way?

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