Essentially, the function for this:
There isn't really a context, I'm not currently studying anything relating to this, it just interests me to see the behaviour of waves.
I seem to have found it, by looking for an example image.
z = sinx(√(x2+y2))
The amount of water in a tank doubles every minute. If the tank was full at the 1 hour mark, when was the tank half full?
It's not homework, I'm just trying to get the actual (reasoned) answer..
Here is the answer I argued (though...