No need for finding / calculating any phi or angle here. Just simpler than it is written.
Implement simple rotation cypher
Find out missing number from a vector of 9 elements
Equal to their cube
Is it an Armstrong number?
Pythagorean perfect squares: find the square of the hypotenuse and the length of the other side
Is this matrix orthogonal?
Is A the inverse of B?
What is the distance from point P(x,y) to the line Ax + By + C = 0?
How many days does the cat take to climb out of the hole?
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