No need for finding / calculating any phi or angle here. Just simpler than it is written.
Get the area codes from a list of phone numbers
Project Euler: Problem 9, Pythagorean numbers
Calculate the area of a triangle between three points
kmph to mps
2倍してみよう - ここからスタート！
Find the nearest integer
Flip the main diagonal of a matrix
How many days does the cat take to climb out of the hole?
Is this matrix orthogonal?
Find the largest value in the 3D matrix
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