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Mathematics 8 Online
OpenStudy (anonymous):

dy/dx ln(9te^(-7t))

OpenStudy (anonymous):

\[ 1/9\,{\frac {9\,{{\rm e}^{-7\,t}}-63\,t{{\rm e}^{-7\,t}}}{t{{\rm e}^{- 7\,t}}}} \]

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