You should think about having an input variable rather than describing it as only -90 degrees in the description.
Easy to do, what's your reasoning?
Determine whether a vector is monotonically increasing
Project Euler: Problem 7, Nth prime
Set the array elements whose value is 13 to 0
Given a matrix, swap the 2nd & 3rd columns
Is the input divisible by 3?
Relative points in 2D: problem 1
Homogeneous lines and points in 2D: problem 1
Orientation of a 3D coordinate frame
Relative pose in 2D: problem 2
Relative points in 2D: problem 2
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