x and y are input vectors, d is a number and contains their dot product
There could be other test cases for this particular problem such as for example if one of the inputs (either x or y) is a column vector.
Remove the polynomials that have positive real elements of their roots.
Back to basics 21 - Matrix replicating
Getting the indices from a vector
Calculate the area of a triangle between three points
Given a matrix, return the last eigen value
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