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.
So many choices
Make a run-length companion vector
Matlab Basics II - Count rows in a matrix
Find the Sum of the Series:
Find matrix of indices for multidimensional matrix.
Find the sum of the negative elements under the main diagonal.
Solve the following boundary value problem
Find the product of the positive elements above the main diagonal.
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