280*(1-cos50)*sin8
    280*(1-cos50)*sin7.5
    280*(1-cos60)*sin7.5
    350（1-cos60）sin7.5
    （1-cos60）sin12
    31÷32
    4×sin0.25
    1/8×299×17^2+1000×17/4
    1/8×299×17^2+2000×17/4
    1×19.1×21340×37×(1240-7.5/2)+360×30159×(1240-15)
    1×19.1×21340×7.5×(1240-7.5/2)+360×30159×(1240-15)
    (360×38613-360×30159)/(1×19.1×21340)
    150×π×8^2
    1×19.1×21340×34.1×(1240-34.1/2)
    (360×38613)/(1×19.1×21340)
    (1×19.1×21340)/(360×38613)
    (1×19.1×21.34)/(360×38613)
    51×π×7^2+153×π×8^2
    5×3
    (200000/36)+[200000－(200000/36)]*(4.85%/12)

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