2-tan(1)
    tan(0)
    tan(-1)
    （7.7*0.58+7.7*0.67）*0.8
    4÷4/5-4/5÷4
    4 ÷4/5-4/5÷4
    (7/12+3/8)*24
    （1+5%）^3-1/5%
    0.1（92）
    3000（1.04）^15.3487*2
    log(1.04,sqrt10/3)
    log(1.04,10/3)
    46÷5
    120*(3/10+1/2-3/5)
    1/6*1/3*8/5
    1/6*1/3/5/8
    180-90-arctan(0.2*8)-arctan(0.5*8)+arctan(1.26*8)-arctan(0.012*8)
    180-90-arctan(0.2*5)-arctan(0.5*5)+arctan(0.5*5)-arctan(0.08*5)
    180-90-arctan(0.2*sqrt(10))-arctan(0.5*sqrt(10))
    32*80-256

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