0.018*0.988
    sqrt(0.018)/0.135738
    20lg7.541
    2.4*3.142
    4/sin65.38
    180-162
    -90-arctan(0.05*6.83)-arctan(0.2*6.83)
    -90-arctan0.05*6.83-arctan0.2*6.83
    0.02*1.035
    1/(6.83*sqrt(0.02))
    2.175*3.142
    0.02*1.035
    1/(6.83*sqrt(0.02))
    20lg6.83
    20lg20
    20lg5
    1/0.05
    1/0.2
    2.175*3.142
    2+1.5*((1/sin65.38)-1)+2.5*((1/sin65.38)-1)^2

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