Mathematics
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    cos3/5
    arccos(3/5)
    176.9/1.2
    e(-1.8138)
    1/8×299×17^2+1000×17/4+1000×16/17
    1/8×299×17^2+1000×17/4+1000×16/17×0.53
    100乘14000加80乘26000加150乘30000
    100乘2
    200 2:3
    2:3
    2:3
    200*2:3
    280*(1-cos60)*sin8
    300*(1-cos60)*sin9
    280*(1-cos60)*sin9
    230*(1-cos60)*sin9
    230*(1-cos60)*sin8
    230(1-cos50)sin6
    230*(1-cos50)sin6
    230*(1-cos50)*sin8

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