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).
Angle between two vectors
Make a 1 hot vector
Sum the numbers on the main diagonal
Calculate the derivative of a polynomial
Divide by 4
Find out value of sine given by degree.
Add one raw in given matrix as shown in example
Check transmitted data follow even parity (True or false)
Add two different item as shown in example
calculate interest saved because of reduction of interest rate
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