求导函数
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求导函数:y=[(x+5)²(x-4)^(1/2)]/{[(x+2)^5][(x+4)^(1/2)]}(x>4)
解:取对数:lny=2ln(x+5)+(1/2)ln(x-4)-5ln(x+2)-(1/2)ln(x+4)
两边取导数得y′/y=2/(x+5)+1/[2(x-4)]-5/(x+2)-1/[2(x+4)]
故y′=y{2/(x+5)+1/[2(x-4)]-5/(x+2)-1/[2(x+4)]}
={[(x+5)²(x-4)^(1/2)]/[(x+2)^5][(x+4)^(1/2)]}{2/(x+5)+1/[2(x-4)]-5/(x+2)-1/[2(x+4)]}
解:取对数:lny=2ln(x+5)+(1/2)ln(x-4)-5ln(x+2)-(1/2)ln(x+4)
两边取导数得y′/y=2/(x+5)+1/[2(x-4)]-5/(x+2)-1/[2(x+4)]
故y′=y{2/(x+5)+1/[2(x-4)]-5/(x+2)-1/[2(x+4)]}
={[(x+5)²(x-4)^(1/2)]/[(x+2)^5][(x+4)^(1/2)]}{2/(x+5)+1/[2(x-4)]-5/(x+2)-1/[2(x+4)]}
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