Mathematics
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     tan(arccos0.810)
     tan(arccos0.95)
     tan(arccos0.96)
    arccos(6378.14*cos(5)/(7878.14))-5
    2*27.7287
    arccos(0.8550/(cos(180/12)))
    sin0cos0
    e^(1+60)
    lg(5)^2+lg(2)*lg(50)
    ㏒(50)
    ㏒(5,35)
    ㏒(0.5,√2)
    2×㏒(0.5,√2)
    2×6
    67-(-75)-33
    -105.772907tan200
    -52.151626tan240.1
    17.35388tan(360-79.8)
    86.113697tan(360-39.7)
    -52.282332*tan119.8

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