2.5*2.25*9.33*1/3
     1/3*(2*2.89*5.49)
     1/3*(2.5*2.25*9.33)
     arctan(cos(90-15)tan(35))
    1.69/tan10.27
    arctan(cos(90-15)tan(35))
    2.5*tan34.07
    3.32*tan34.07
    2.5+((2.5*sin34.07)/sin(180-110-34.07))*cos70
    7*2^0.3
    7*0.5^0.3
    7*2^0.15
    7*0.5^0.15
    1.2*1.4*1.25
    1.2*(1.4*0.25+1 ）
     1.2*(1.4*0.25）+1
    （1.2*0.25）+1
    e^(-10)
    102.89*0.156
    10/(0.156*0.623)

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