Please don't use tangent and sine functions
Not a general solution. Passes only due to small number of cases in the Test Suite.
surface of a spherical planet
Back to basics 8 - Matrix Diagonals
Check if number exists in vector
Sum of the Matrix Elements
Circular Shift Me
Upper Matrix in LU Decompositon
Add Me To Death (Sum sum sum)
Some tweaks in summation, Can you decode? :)
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