0*0
    0/0
    2:2:2:2
    1:3
    3:2
    -1-1-1-1(-3)
    sin1.58
    -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

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