设y=ln[x+√(x22)](α>0),求y'.
设y=ln[x+√(x22)](α>0),求y'.
【正确答案】:解:y'=[1/(x+√(x22)](x+√(x22))' =1/[x+√(x22)]•{1+2x/[2√(x22)]} =1/√(x22)
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