tan15
    arctan0.36
    arctan0.25
    arctan0.5
    tan26.31
    212-7920/63+200
    (2.34)^(1/3)
    1/(7.69*sqrt(13.9))
    1/(7.5*sqrt(13.9))
    16/(0.268*sqrt(0.268^2+1))
    1/sqrt(13.9)
    (2+sqrt(3))/(2-sqrt(3))
    3.414/(2-1.414)
    90-arctan4
    arctan4
    arctan4
    -90-arctan4
    -90-arctan4
    -90-arctan4
    -90-arctan3.94

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