ln2/2
    e^0.766746
    e^x*x^2=1-lnx
    arcsinx=arctanx
    x/8-8.6=0
    4900xx-168√3x-1089=0
    4+p/8=5.6
    4+8/p=5.6
    1.5s + 10 = 12.25
    3y - 1.6 = 1.7
    x^2=2
    2^x=1/x
    （7+y）（22-y）=170
    400a^(2)－800a+39=0
    x^4+75*x^2-100=0
    25x^2-60x+32
    2.718^(-2)/1-2.718^(-1)
    cosa=-9/√130
    cos(13/180)
    cos(13)

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