816.7-（69.9+14.9+49.9+17.9+69.9）-69.9-40+112
    10^5
    1*10^5
    90+arctan(4.2*2.5)-arctan(0.1*2.5)-arctan(0.2*2.5)-arctan(41*2.5)
    90+arctan(4.2*2.5)-arctan(0.1*2.5)-arctan(0.2*2.5)-arctan(41*2.5)
    90-arctan(0.1*3)-arctan(0.2*3)-arctan(41*3)+arctan(3.69*3)
    90-arctan(0.1*3)-arctan(0.2*3)-arctan(41*3)+arctan(4.2*3)
    90-arctan(0.1*3)-arctan(0.2*3)-arctan(41*3)+arctan(4.2+3)
    90-arctan(0.1*2.3)-arctan(0.2*2.3)
    90-arctan(0.1*12)-arctan(0.2*12)
    90-arctan(0.1*9.7)-arctan(0.2*9.7)
    90-arctan(0.1*47)-arctan(0.01*47)
    90-arctan(0.1*91)-arctan(0.01*91)+arctan(0.052*91)-arctan(0.004*91)
    1/(80*sqrt(13))
    90-arctan(0.1*47)-arctan(0.01*47)
    90-arctan(0.1*47)-arctan(0.01*47)
    90-arctan(0.1*9.7)-arctan(0.2*9.70)
    1/(sqrt(2.3)*11.8)
    (1+sin24)/(1-sin24)
    90-arctan(9.3/5)

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