No need for finding / calculating any phi or angle here. Just simpler than it is written.
Distance walked 1D
Is the Point in a Circle?
Compute a dot product of two vectors x and y
Remove the two elements next to NaN value
Find the nearest integer
Flip the main diagonal of a matrix
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Solve the set of simultaneous linear equations
How long do each of the stages of the rocket take to burn?
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