arctan2-arctan20
    lnx=7.02
    12x^2-10x+1＝0
    12x^2-10x+5＝0
    arctan(2*-35.2)+arctan（8*-35.2)
    arctan(2*-35.2)+arctan（8*35.2)
    arctan0.84+arctan3.36
    （x+2）^6
    2000000*0.49*((2/2.4)^3)*sqrt(2.4/(345*3000))
    2000000*0.53*((2/2.4)^3)*sqrt(2.4/(345*3000))
    2000000*14.8*((2/2.4)^3)*sqrt(2.4/(345*3000))
    4/27
    (5/3)^3-4*(5/3)^2+5*5/3-2
    arctan0.64
    172÷319
    √131345
    219/sqrt(126922)
    -281/sqrt(126922)
    −219/sqrt(126922)
    arccos0.9＝

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