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    tan(arccos0.74)-tan(arccos0.92)
    tan(arccos0.72)-tan(arccos0.92)
    tan(arccos0.86)-tan(arccos0.92)
    tan(arccos0.89)-tan(arccos0.92)
    2019÷2020/2021
    90+arctan(6.67*1.5)-arctan(44.47*1.5)-arctan(0.5*1.5)-arctan(0.5*1.5)
    tan(arccos0.78)-tan(arccos0.92)
    tan(arccos0.75)-tan(arccos0.92)
    1.21×(0.56×0.001×0.001)×(2+0.6×0.58)×157×330×215×1504.75×1504.75÷586.71÷586.71=
    1.21×(0.56×0.001×0.001)×(2+0.6×0.58)×157×330×215×1504.75×1504.75÷581.93÷581.93=
    1.21×(0.56×0.001×0.001)×(2+0.6×0.58)×157×330×215×1504.75×1504.75=
    1+1
    10*5
    1/2+0.8/4.2
    1/2+0.8/4.2
    1/2+0.8/4.2
    -1/5-1/2
    -1/5
    cos(0.0001)
    1-cos(0.0001)

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