cos13
    99/1.111
    -sin（π/4 ）
    -sinπ/4
    arctan0.373544
    tan20/cos13
    arctan0.37
    tan20/cos13
    cos14
    cos15
    sin150
    -14-（-2）+0.5*0.5
    0.83^0.67
    0.75^0.67
    0.8^1.2
    1.5^0.3
    4400÷2.2+4400
    （120+96）÷27
    72÷0.6
    9000÷1.2

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