An Oldie but Goodie!
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Math.
I thought you were a child
OOOOOHHHH I just got it
It’s saying that if you have (1^3) + (2^3)
(1^3)+(2^3)+...+(n^3)=(1+2+...n)^2
Example
(1^3)+(2^3)=(1+2)^2
(1^3)+(2^3)+(3^3)=(1+2+3)^2
Etc.