-1-1-1
    tan(18.434949+15)/tan(18.434949-15)
    tan(18.434949+15)/tan(18.434949-15)
    3%%%%%
    3%
    log4
    1E2
    1e2
    1414*1414
    2^0.5*1.414
    2^0.5^2
    2^0.5
    15198.07×0.8+9675.61×0.2
    15109.78×0.8+9675.61×0.2
    10408925/1075.79
    3181464+7227461
    589648/4.8%×（1-1/（1+4.8%）^41.35)×(1/(1+4.8%)^8)
    (0.1-(1-0.9^4))/(1-0.9)
    (0.1-(1-0.9^4)/(1-0.9)
    arctan56/33

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