No need for finding / calculating any phi or angle here. Just simpler than it is written.
Determine if input is odd
Deleting an element in a matrix
How many days does the cat take to climb out of the hole?
Find the nearest integer
Is this matrix orthogonal?
Pythagorean perfect squares: find the square of the hypotenuse and the length of the other side
Create a square matrix of multiples
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