-8×（3/4）^2＋12×3/4
    3.84*9.6+9.6*61.6=
    3600*6/(sqrt(20))
    6*9
    10lg6.544
    (1+sin47.3)/(1-sin47.3)
    sqrt(2000)
    arctan(sqrt(20))
    20lg(0.082256)
    1/9/sqrt(1.0081)/sqrt(1.81)
    180-arctan0.09-arctan0.9-90
    24^2+16^2+40*48
    log(2,1/2)+log(1/2,2)
    9^(1/3)
    sin29.0612
    cos29.0612
    arccos(0.855/(cos(180/15)))
    arctan(√2/2）
    arctan1/2
    arctan√2/2

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