0.6 ×0.6 ×25+0.02×0.6 ×4×20=
    90-arctan(0.12*12.52)-arctan(0.02*12.52)-arctan(0.0509*12.52)+arctan(0.1252*12.52)
    24600^0.25
    (20000)^(0.25)
    226.2+47.844+217.5+791.7+178.706+171.833
    (1+sin20)/(1-sin20)
    3.273*7.5*7=
    3.273*7.8*7=
    3.625*7.8*8
    90-arctan(0.12*12.52)-arctan(0.02*12.52)-arctan(5.83*12.52)-arctan(0.0509*12.52)+arctan(0.1252*12.52)+arctan(12.52)
    2.46^0.5
    (1+sin(25))/(1-sin(25))
    90-arctan(0.12*10)-arctan(0.02*10)-arctan(5.83*10)+arctan(10)
    90-arctan(0.12*10)-arctan(0.02*10)
    90-arctan(0.12*24.15)-arctan(0.02*24.15)
    3.14159*(2+1.5*0.6+2.5*0.6*0.6)
    （-2）^（6/2）
    （-2）^（2/6）
    2√2/√6+√2
    2√3/√6+√2

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