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1、P743(7)、22arctan222arctanarctan22222 22221arctan 21arctan2122arctan2y xyy xxxydxyad eyd xydxxyyd xydxxaeayyxdxydydxxyeP452(5)、答案全部错误!反例如下:、答案全部错误!反例如下:A、(x)0gB、(x)0gC、211(x), (x)sin(x)1 1(x)sinx=0fgxxx f gxx无极限分母是无穷小量,但分母在任意邻域内有无穷多个零点极限的定义要求在去心邻域内有定义D、(x)0gP463(9)、00002302302023020lim1 sinsin(absinx
2、)limsin1 sinsin(absinx)limx1lim1 sinsin(absinx)01 sinsin(bsinx)limx 1 sinsin(1lilimlimlim01m1xxxxxxxxxffAfxxAxxxAaxxxxAxxggga223220322202022002bsinxsin x)x1 sinsin(1bsinx)sin(1 2 )(1)sinlim x1 sinsin(1bsinx)(1 2 )(1)sinlim2x(1 2 )lim (1 2 )(1)sin0(1)sinlim2x (1=l1im2xxxxxbA xxxbbxA xxbbxAbbbxbxAbb2 2)sin2xAx 题目错误,分母的阶数太大了,