You need multiple tests to check a variety of situations.
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
improve test suite
Remove the polynomials that have positive real elements of their roots.
Back to basics 23 - Triangular matrix
Is this triangle right-angled?
Convert given decimal number to binary number.
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