Write a function that has the following property: f(f(x)) = -x for any numeric array x.
Note that there is no restriction on the output for f(x). How bizarre can you make it?
This one really surprised me.
Getting a little silly!
Back to basics 15 - classes
Angle between Two Vectors
05 - Vector Equations 3
Fangs of a vampire number
Find all vampire fangs
Product of two multivariate polynomials
Multivariate polynomials - emulate symbolic form
Multivariate polynomials - convert monomial form to array
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