What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
Remove all the consonants
Is my wife right?
Reverse the elements of an array
Find out value of sine given by degree.
Matlab Basics II - squares
Find 10's complement
Converter temp 0 to 200 degree C to 4 to 20mA
Generate vector according to sign of vector
Find the mode of the given input
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