(-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
    -0.0000105714 *2*303 + 0.0052544286
    -0.0000105714*2*303 + 0.0052544286
    -0.00001*303*303 + 0.0053*303- 0.4481
    -0.0000105714 *303*303 + 0.0052544286 *303 - 0.4480974286
    0.0263*41^4 - 0.8797*41^3 + 9.1565*41^2 - 13.115*41 - 37.075
    1÷3.84
    1.28*41^3 - 48.251*41^2 + 525.29*41 - 1263

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