An Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself. For example, 153 is an Armstrong number since 1^3 + 5^3 + 3^3 = 153.
Renaming a field in a structure array
Angle between two vectors
Generate N equally spaced intervals between -L and L
intersection of matrices
convert tan to sin
Given area find sides
given 4x4 matrix swap the two middle columns
Find the logic
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