If you really want help with this problem, put together a small test suite that gives some inputs and some sample outputs (that you tabulate by hand) and wait for someone to produce a MATLAB function to do what you want.
This is an interesting problem. Acting as an administrator, I cleaned it up and added some tests.
radius of a spherical planet
given 3 sides, find area of this triangle
Check if number exists in vector
Derivative of polynomial
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