This is cheating.
it's not, this is a direct and clever solution to the specified problem which would not work for other arbitrary Cody problems, hence not cheating (in my book)
Test for balanced parentheses
Great Circle Distance
Bottles of beer
Area of an equilateral triangle
Twists in 2D
Homogeneous lines and points in 2D: problem 1
Composing relative poses in 2D: problem 1
Invert a 3D rotation matrix
Relative pose in 2D: problem 1
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