((0.5*tan10+tan27.95)/(1-0.5*tan10*tan27.95)-1/tan27.95)/((0.5*tan18.3+tan(27.95*1.83))/(1-0.5*tan18.3*tan(27.95*1.83))-1/tan(27.95*1.83))
    0.5*((0.5*tan10+tan27.95)/(1-0.5*tan10*tan27.95)+1/tan27.95)*35.36
    0.5*((0.5*tan10+tan27.95)/(1-0.5*tan10*tan27.95)+1/tan27.95)*50
    tan(70.34)/((-1/61.31)*((0.5*tan10+tan29.57)/(1-0.5*tan10*tan29.57)-1/tan29.57)*(1/2))
     (-1/61.31)*((0.5*tan10+tan29.57)/(1-0.5*tan10*tan29.57)-1/tan29.57)*(1/2)
    （1.06）^（-2）
    ((0.5tan10+tan29.57)/(1-0.5tan10tan29.57)-1/tan29.57)/((0.5tan16.7+tan(29.57*1.67))/(1-0.5tan16.7tan(29.57*1.67))-1/tan(29.57*1.67))
    60*(1+e(-1.5)-e(-0.5))
    1+e(-1.5)-e(-0.5)
    0.5((0.5tan10+tan29.57)/(1-0.5tan10tan29.57)+1/tan29.57)35.36
    0.5((0.5tan10+tan29.57)/(1-0.5tan10tan29.57)+1/tan29.57)50
    0.5((0.5tan10+tan29.57)/(1-0.5tan10tan29.57)+1/tan29.57)
    (0.5tan10+tan29.57)/(1-0.5tan10tan29.57)+1/tan29.57
    cos20
    36.9÷0.22=
    (14-64/7)/0.4*2
    (14-64/7)/0.4
    345.6-5
     ln(1/0.444)
    (857-1000)/1000

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