No need for finding / calculating any phi or angle here. Just simpler than it is written.
Find relatively common elements in matrix rows
Numbers with prime factors 2, 3 and 5.
Rounding off numbers to n decimals
Reverse a matrix
Pernicious Anniversary Problem
Solve the set of simultaneous linear equations
How many days does the cat take to climb out of the hole?
How long do each of the stages of the rocket take to burn?
Pythagorean perfect squares: find the square of the hypotenuse and the length of the other side
Is A the inverse of B?
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