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
Determine Whether an array is empty
Vectors counting by 2
Rotate matrix by -90 degrees
function to compute root mean square of first nn positive odd integers
Find NaNs in the matrix
surface areas of a cylinder
Perimeter of a semicircle
Repetition of matrices
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