1.8/2.3
    10×(5/8－4/1÷0.25)
    80-38÷40
    80÷38-40
    80÷38÷40
    3(5-2*1.869694)^0.5+(13-6(4-1.869694^2)^0.5)^0.5
    225×216
    30÷2.5
    3:1×600
    3:1÷600
    √（（42^3+42^3+43^3+36^3）/（42+42+43+36））
    asin(1.4/2)
    log(2)
    （1+0.0435）^0.5-1
    [（1+0.0435）0.5-1]
    1017×[（1+0.0435）^1-1]
    asin(1/0.75)
    asin(1/1.5)
    tan(2*arctan1/2)
    tan(2arctan1/2)

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