Is there a keyboard shortcut that will trigger the AC button on the OS X Yosemite calculator? Escape key triggers the Clear (C), but hitting escape again does NOT trigger the AC. Only a mouse click does.
On my MacBook Pro, AC/All Clear can be achieved by fn + esc.
On a wired extended keyboard, it's the 'square with an X in it' above 7. ⌧
I don't know where it is on a laptop or short keyboard.