arctan0.00062
    sqrt(200*485)
    arctan0.625
    arctan2
    arctan2
    arctan1278
    arctan36
    arctan0.628
    1/400*3.14*0.5
    arctan400*3.14*0.1-1/400*3.14*0.5/200
    arctan400*3.14*0.1-1/400*3.14*0.5/200
    arctan400*3.14*0.1-1/400*3.14*0.5/200
    arctan36
    arccos0.959
    arccos140/146
     tan(arccos0.74)-tan(arccos0.92)
    tan(arccos0.736)-tan(arccos0.92)
    tan(arccos0.853)-tan(arccos0.92)
    4*4/4
    tan(arccos0.804)-tan(arccos0.92)

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