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.
Find the sum of the elements in the "second" diagonal
Return unique values without sorting
Determine Whether an array is empty
Return 'on' or 'off'
Solve the system of equations.
Calculate the centroid of a triangle
Find the sum of the negative elements under the main diagonal.
Solve the following system of equations.
Return the amount of palindromes (words) in the string.
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