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
Calculate the derivative of a polynomial
Dimensions of a rectangle
Check that number is whole number
Create a Matrix of Zeros
Matrix of almost all zeros, except for main diagonal
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