［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
    10*sqrt(1+2.6^2)/(2.6*sqrt(1+0.01*2.6^2)*2.6/6.5)
    arctan2.6-90-90-arctan0.1*2.6
    180+arctan3.23-90-arctan32.3-arctan(3.23/50)
    5*sqrt(1+100*25)*sqrt(1+25)
    180-90-arctan4.5-arctan0.45
    180+arctan4-90-arctan20-arctan0.2
    1/2×1.25×〖34.155〗^2×2.05×0.45
    1/2×1.25×〖34.155〗^2×2.05×0.0049
    180-90-arctan(1.08(sqrt(2)-1))
    arctan0.1
    -90-arctan10-arctan0.1
    arctan100-arctan2-arctan0.1
    180+arctan(8*33)-90-arctan66-arctan(33/22)
    arctan0.1-90-arctan0.02+180

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