－0.4×16＋3.2×4－2.8
    (28.67-27.24)/(28.67-20.785)
    (29.1-27.24)/(29.1-20.785)
    (180-72.56)/2
    arccos((cos45*sin45*cos45*sin45)+(sin45*sin45*sin45*sin45*sin45*sin45))
    arccos((cos20*sin40*cos340*sin40)+(sin20*sin40*sin340*sin40*sin40*sin40))
    arccos((cos15*sin35*cos345*sin35)+(sin15*sin35*sin345*sin35*sin35*sin35))
    arccos(cos15*sin35*cos345*sin35+sin15*sin35*sin345*sin35*sin35*sin35)
    10.60*27
    17.49*27
    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

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