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 two most distant points
06 - Matrix Equations 3
Area of a disk
Product of Array
Replace every 3rd element in a vector with 4
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