Return the sum of sum(res.y)
Tip: use bvp4c
given 3 sides, find area of this triangle
Return the first and last character of a string
Replace Vector Elements
02 - Vector Variables 1
Find the product of the positive elements above the main diagonal.
Find the sum of the negative elements under the main diagonal.
Solve the system of equations.
Check if a string starts with another string
Calculate the centroid of a triangle
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