cos7/4
    arccos-0.707
    8/9*8
    504/350
    sin90
    cos90
    cos30
    sin30
    579²＝
    arctan1/4
    5cos8
    9999999*9999999*9999999
    9999999999*9999999999
    sqrt(2+sqrt(3))+sqrt(2-sqrt(3))
    -1/2-1/6-1/12-1/20-1/30-1/42-1/56-1/72
    3sqrt(3)
    arcsin（1÷1.33）
    arctan1.95
    1+1=
    3√2

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