√((4-1.664)/3×(1-2.22)+2.22/1.664)
    (1×28×tan14)/π
    [28×(tan28.88-tan20.562)+89×(tan23.61-tan20.562)]/2/π
    [28×(tan28.88-tan20.562)+89×(tan23.61-tan20.562)]/2π
    arccos[89×cos20.562/(89+2×1×cos14)]
    arccos[28×cos20.562/(28+2×1×cos14)]
    arccos (123/130)
    1-2/3/2
    1/3+1
    3333-3333
    3^1
    1^10
    1^3
    1^1
    2^1
    -21.5*3
    180-52-90
    180-52-90
    180-52-90
    180-50

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