Given an odd number n, write a function that creates a matrix y with dimension nxn alternating 1's and 0's, and starting with 1 in the center of the matrix. For example, for n=3 one should get:
y = [0 0 0 ; 0 1 0; 0 0 0]
Angle between Two Vectors
Side of an equilateral triangle
Say type of roots in quadratic equation
Approximate the inverse tangent by power series
Ratio between sum of primes and sum of factors
Get the mean digit
Ratio between sum of primer numbers and non-prime numbers
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