cos(13/180)
    cos(13)
    2.718^(-2)
    4x
    400*8.314*（ln10）
    20*14.74/3.1415926*（tanx-x）+7.68*cosx=8.62
    0.67*720
    2.718^(-2/5)
    55x^2-56x+14=0
    sina=2√5/5
    cosa=√5/5
    x除0.5＝48.6乘2
    85×4＋4x =700
    2.718^(-5/3)
    x^(1/4)=20.192
    (28-37.59)^2/37.59
    x^0.25=20.192
    (11-7.87-24.32)^2/24.32+7.87
    173*0.0032
    173*0.0094

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