Mathematics
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    cos(arctan0.75)
    sin(arctan0.75)
    12000/3000×1.125/1.128
    800*(tan(arccos0.721)-tan(arccos0.95))
    sin30
    800*tan(arccos0.721)-tan(arccos0.95)
    csc30
    sec30
    sec45
    (-1)^(1/3)
    -0.5*84+84+12
    (4+84)(3-(84/2))
    (4*-0.5*12-12^2)/(4*-0.5
    (4*-0.5*12)/(4*-0.5)
    1700/135
    cos30
    1+1
    arctan4/3
    arctan3/4
    arctan3/4

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