d 1 Use (x)= .- 1 to find the derivative of the inverse at the indicated point. dx 1 d -1 Let f(x) = - 9x° - 9, x2 0. Find dx [Note that f(2) = - 81.] x= - 81

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A: log10x=4⇒x=104⇒x=10000

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A: answer is in next step