90-arctan(0.1*6)-arctan(0.2*6)
    90-arctan(0.1*11.44)-arctan(0.2*11.44)
    1500^(1/3)
    150^0.5
    (((5-2*2^0.5)^0.5-2^0.5+1)/(1+3^0.5))^0.5
    9.96*4.2*32
    9.96*（5.65/2+4.2/2）*32
    0.25*0.6*25=
    0.25*0.6*25*7.8=
    2*2.414214^3-7*2.414214^2+4*2.414214-2019
    0.39×12×83400/5.35/5.35
    6.719-（-7.166+7.347）/6.6=
    0.6*0.6*25*4.2
    1/sin40
    14.25-（-8.531+9.367）/3
    14.25-（-8.531+9.367）
    -63.162-（-59.025+63.941）/6.6=
    63.162-（-59.025+63.941）/6.6=
    0.39×12×114400/5.3/5.3
    -7.104-(-8.170+7.952)/6.9

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