Nice test cases!
With a more robust Test Suite many/most of the submissions would fail for ignoring the Problem Statement instruction that primes must be less than n. Please add test cases in which the input x (or "n") is itself a prime.
Is A the inverse of B?
CONVERT TAN TO SIN
Create a two dimensional zero matrix
Sum of series VI
Matrix of almost all zeros, except for main diagonal
Sum of cubes
Energy of an object
Determine the roots of a cubic equation
Display negative numbers
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