Return the sum of sum(res.y)
Tip: use bvp4c
Sum all integers from 1 to 2^n
Replicate elements in vectors
Symmetry of vector
Create sequnce 1 4 9 16 25.........
Create cotangent function out of sine.
Return ! if array element starts with a certain letter. Otherwise return ?
Numerate input arguments
Solve the system of equations.
Find the product of the positive elements above the main diagonal.
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