It's a shame that eval() is banned across all of Cody. I understand how its exploitation got out of hand, but this is the sort of problem where it's best suited (and should be legal).
Check if number exists in vector
Count up then down
Is this triangle right-angled?
Find the rank of a matrix
Create vector as shown in test cases
find out eigenvector of matrix
Compute LOG(1+X) in natural log
Find out value of polynomial at different value.
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