The function is and the point is
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Inverse relations of logarithms: .
Apply derivative on each side with respect to .
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Slope of the tangent is derivative of the function at the given point.
\Slope of the tangent line at .
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Slope of the tangent at is
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Point-slope form of line equation: .
Substitute and
in point-slope form.
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The tangent line equation is .
The tangent line equation is .