Mathematics
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    230(1-cos50)sin6
    230*(1-cos50)sin6
    230*(1-cos50)*sin8
    230*(1-cos60)*sin6
    230*(1-cos50)*sin6
    280*(1-cos50)*sin6
    280*(1-cos50)*sin4.5
    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

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