As per Solution 1043996, need to ban a couple of other functions to enforce instruction.
This is wrong. For example, x = 3*pi/4, cot(x) = -1; but this solution gives sqrt(1-sin(x)^2)/sin(x) = 1.
Remove the two elements next to NaN value
Count up then down
Maximum value in a matrix
UICBioE240 problem 1.9
Return ! if array element starts with a certain letter. Otherwise return ?
Find Adjacency Matrix
Calculate the centroid of a triangle
Solve the system of equations.
Find the sum of the negative elements under the main diagonal.
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