4.83*(14*13.973+14+14.21+7*13.049+14*4.855)+0.888*(16*12.893+222*4.422+111*5.024)+1.58*116*1.2
    arccos0.21
    π+arctan2
    arccos-0.4
    π-arccos-0.4
    π+arccos-0.4
    π+arcsin-0.4
    arcsin-0.4
    π+arcsin-0.7
    π-arcsin0.7
    arcsin0.7
    arcsin0.5736
    π+arctan3
    π-arctan3
    2π-arccos0.2
    arccos0.2
    2^-1
    2^log(½，3)
    log(½，3)
    3+3

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