5800-71
    12900-7100
    20000-7100
    20000/71
    1/sin(54.353525)
    2/sin(37.937085)
    3/sin(42.422383)
    1/sin(37.937085)
    1/sin(42.422383)
    (1/(0.4+1000))^0.5+(100/(400+1))^0.5
    (1/(0.4+100))^0.5+(100/(40+1))^0.5
    A(-3,0 P(-1,-4)
    -0.5*2.5+1.5*2.5+2
    10^-(6.7/20)
    3/sqrt(4*9)
    （36+17.1*4.8+18.2*4.7）*0.53-2*45*0.73
    （（（1+0.61677）^70）-1）/0.61677
    arccos0.82
    arcsin0.95
    2*8.314*ln(466/299)

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