Please don't use tangent and sine functions
Not a general solution. Passes only due to small number of cases in the Test Suite.
2 b | ~ 2 b
Replace Vector Elements
Replace every 3rd element in a vector with 4
Create cosine function out of sine
Upper Matrix Mock
Upper Matrix in LU Decompositon
Rotate matrix by -90 degrees
Create tangent function out of sin and cos
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