e(-20)-e(-10)
    (e(-10)-1)e(10-10*1.1)
    (e(-10)-1)*e0
    (e(-10)-1)e(10-10*1.5)
    cos(135)
    tan(0.25π）
    tan0.25π
    2^10000
    0^(-1)
    0^0
    8/10-1 8/X-1=-0.2
    8/10-1 8/X-1
    8/10-1
    e(-10)-1
    e(-10)
    0.5*10+0.4*30+0.1*50
    (180000*1.12)/360*(0.1*50+30*0.4+0.5*10)
    （180000*1.12）/360*(0.1*50+30*0.4+0.5*10)*0.15
    tan（-102.12）
    e^

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