tan(arccos0.8)
    sqrt(1200*1200+563*563)
    1200/0.65
    1200*1.16913
    1200*0.684808
    1.16913-0.484322
    tan0.451027
    tan0.863212
    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))

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