What you're looking for is not called the "characteristics equation", but the characteristic polynomial.
More test cases, please. ;-)
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Angle between two vectors
Celsius to Kelvin
Add one raw in given matrix as shown in example
Find difference of two set as per example
Change the first and last diagonal element of the identity matrix to zero
Create an anti-identity matrix
Find out total non zero element of matrix
Flip the vector from right to left
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