What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
First N Perfect Squares
Create a Multiplication table matrix...
Area of an equilateral triangle
Concatenate two strings
Vectors counting by 2
Crate a vector of logarithmically spaced
Do operation as per given string
Create vector as shown in test cases
Union of two set decreasing order
Convert given decimal number to binary number.
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