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
Maximum value in a matrix
Product of all elements in an array
count upper and lower case characters
Basic matrix operations using standard MATLAB commands
Remove white spaces at the end of the input string
Raise each element to the power of its index in a matrix
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