Please, don't use cos, tan, cot matlab functions.
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.
Make a checkerboard matrix
Project Euler: Problem 5, Smallest multiple
Area of a triangle
Test Problem; Create a 5x5 array containing all ones
Return ! if array element starts with a certain letter. Otherwise return ?
Numerate input arguments
Find the sum of the negative elements under the main diagonal.
Return the amount of palindromes (words) in the string.
Find the product of the positive elements above the main diagonal.
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