No need for finding / calculating any phi or angle here. Just simpler than it is written.
First N Perfect Squares
Specific Element Count
Is the Point in a Circle?
The Answer to Life, the Universe, and Everything
Is this matrix orthogonal?
Solve the set of simultaneous linear equations
How long do each of the stages of the rocket take to burn?
Find the "ordinary" or Euclidean distance between A and Z
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