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Cool. But...
How would we know a number is a perfect cube unless told?
valid point.
But you can use it if someone says it is, or when someone types in a two figure in a calculator and the calculate that number ^3, sometimes it is clear when you look at the context etc.
If it is not a perfect cube there are other solutions as well.
But this is a demonstration of the speed and effectiveness of Vedic Mathematics.
If it is too difficult, it isn't Vedic Mathematics, by definition.
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