[考古] 93中正

[topractise (何以奇好正)]

93中正

Give linearization  L(x.y) of the function  f(x,y) = lnx + lny at the point
p(1,1). Then find an upper bound for the magnitude │E│ of the error in the
approximation f(x,y) 近似 L(x,y) over the region

R =  {│x-1│小於等於 0.1 , │y-1│小於等於0.1 }




88中央

tanx在x=-拍/4處的線性化是?

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推 GBRS:第二題就是求在點x=-pi/4的切線方程式...