No need for finding / calculating any phi or angle here. Just simpler than it is written.
Distance walked 2D
Sum all integers from 1 to 2^n
Make an awesome ramp for a tiny motorcycle stuntman
Sum the numbers on the main diagonal
Sum of the Matrix Elements
How long do each of the stages of the rocket take to burn?
Is this matrix orthogonal?
Find the largest value in the 3D matrix
Pythagorean perfect squares: find the square of the hypotenuse and the length of the other side
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