arccos(111/120)
    arccos(111/120)
    48.16×0.6=
    1/3.3^1.5*24
    arccosπ/2
    arccos2/π
    4/7×5/8×7/4
    cos30＋tan60
    cos30＋tan60
    155/187
    565875368539986368524663896368828856996953685553354×9
    565875368539986368524663896368828856996953685553354×9
    565875368539986368524663896368828856996953685553354×9
    34.66×0.6=
    34.66×0.6=
    21×0.6=
    12.66×0.6=
    13.16×0.6=
    18.16×0.6=
    34387867685243375*3438980564943

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