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
Angle between two vectors
Replace multiples of 5 with NaN
06 - Matrix Equations 1
07 - Common functions and indexing 4
Bring up website
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