No need for finding / calculating any phi or angle here. Just simpler than it is written.
surface of a spherical planet
Back to basics 8 - Matrix Diagonals
Pi Estimate 1
Deleting an element in a matrix
Flip the main diagonal of a matrix
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?
Find the nearest integer
Pythagorean perfect squares: find the square of the hypotenuse and the length of the other side
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