-log(0.92,0.21)
    √1559
    √1919
    90-arctan2.23-arctan2.23/4
    90-arctan2.23-arctan2.23/6
    0.05(1.88^2-1.7^2)
    0.05(1.4^2-1.26^2)
    0.05(1.13^2-1.02^2)
    16.33*sin25
    16.33*sin(25)
    16.33sin25
    180-90-arctan0.5-arctan0.25
    180-90-arctan0.4-arctan0.2
    90-arctan2.71-arctan2.71/2
    120*91*（9+20/30）
    19600-20000
    2*0.062*1500
    140*140
    2*0.027*1500
    1500*2*0.016

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