Mathematics
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    acos-0.20790308
    acos-0.20790308
    arccos（-0.2079）
    1+1
    80/3+20
    (8/36)*(18/12)
    sin0.001
    csc30sin19.3775
    sin19.3775csc30
    cos49.3775
    csc20
    csc50
    csc30
    csc30
    sin19.3775csc30
    sin30
    csc30
    sin49.3775
    sin30
    sin79.755

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