2.175*3.142
    2+1.5*((1/sin65.38)-1)+2.5*((1/sin65.38)-1)^2
    0.05*0.2
    1.7^2+3.56^2=
    A(100,78)
    3.14*2535^2
    log(2)3
    log(1,2)
    2.12*0.074
    1/(9.28*sqrt(2.12))
    180-155.9
    sqrt(sqrt(4*0.404^4+1)-(2*0.404^2))*10.9
    sqrt(sqrt(4*0.404^4+1)-(2*0.404^2))
    -90-arctan(0.2*11.18)
    -90-arctan0.2*11.18
    2.86*13.98
    -40/13.98
    20lg5
    20lg10
    1/0.2

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