tan(π/5)*tan(2π/5)+tan(2π/5)*tan(3π/5)+tan(3π/5)*tan(4π/5)
    tan(2π/5)
    tan(π/5)
    27.5×0.6×0.6=
    27.4×0.6×0.6=
    27.3×0.6×0.6=
    33×0.63×0.6=
    33×0.62×0.6=
    33×0.6×0.6=
    15.6×0.6×0.6=
    8^1000000000+9^100000009
    √(81-65)
    √(81-64)
    √81-64
    2÷9801
    sinA(6,3) cosC(10,5) log(89,tan89)
    3sin(π+sin45)
    8.86*42
    8086*42
    8.32*42

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