No need for finding / calculating any phi or angle here. Just simpler than it is written.
What is the next step in Conway's Life?
High school cafeteria
Sum of first n terms of a harmonic progression
Find the "ordinary" or Euclidean distance between A and Z
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Solve the set of simultaneous linear equations
Flip the main diagonal of a matrix
Create a square matrix of multiples
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