Mathematics
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    2.55×5.47
    5.5/1.005
    0.4×5×100/10.5²
    arccos0.5
    arccos0.5
    arccos0.5
    arccos0.5
    arccos0.5
    arccos0.58
    729.94/785.83=
    arccos0.58
    sinarccos0.58
    2*arccos0.58
    arccos0.58
    sinarccos0.58
    2*arccos0.435
    sinarccos0.435
    arccos0.435
    C(3,6)
    arccos(0.1:0.371)

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