-2sin39+2cos3-sin19.5
    -2sin37+2cos37-sin18.5
    -2sin38+2cos38-sin19
    (-2*sin(2*π/10))+2*cos(2*π/10)-sin(π/10)
    (-2*sin(2*π/9))+2*cos(2*π/9)-sin(π/9)
    (-2*sin(2*9/π))+2*cos(2*9/π)-sin(9/π)
    (-2*sin(2*2π/3))+2*cos(2*2π/3)-sin(2π/3)
    (-2*sin(2*3π/2))+2*cos(2*3π/2)-sin(3π/2)
    (-2*sin(2*3π2))+2*cos(2*3π/2)-sin(3π/2)
    5.7*2.66^2+14.445*2.66+164.93
    16.68*2.66^2+107.66*2.66-35.18
    5.7*2.26^2+14.445*2.26+164.93
    √((4×40000)/(π×0.95×[25-0.4(1-〖0.71〗^2 )]×10^6 ))
    576^0.5
    276^0.5
    625-49
    1/4:3/4
    32sqrt（32）-196
    64-1024/25
    -2*0.1743*96485+2*96485*303*-0.0010596

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