For given input matrix a, rotate it by 90 degrees and find the sum of the diagonals.
1 2 3 4
5 6 7 8
8 10 12 -2
-1 -3 -5 -7
Output any real number that is neither positive nor negative
Number of digits in an integer
Product of elements in row
Append two matrix as shown below example
Calculating the total earnings of a factory
Sum of unique multiples of 3 and 5
Basic Quadratic Equation
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