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)
    √569200
    21-6*15^0.3+15/10
    ［2046×（1+0.0465）×1.1080×1.3612+0］×0.9745
    ［1-1/（1+6.50%）^52.20］/［1-1/（1+6.50%）^70］
    1.02^5.18
    2*2
    arctan2.6-90-arctan0.26+90-180
    arctan2.6-90-arctan0.26-90+180
    arctan2.6-90-arctan0.26-90

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