Square a number
I would recommend more test cases, including some of matrices.
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Find the sum of the elements in the "second" diagonal
matrix of natural number
Reverse a matrix
Solving Quadratic Equations (Version 1)
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