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How do i differentiate exp(-9 + 9e^t)

Quote: Originally Posted by CookieC How do i differentiate exp(-9 + 9e^t) Chain rule.. if we write y(t) = exp(-9 + 9e^t) and define u(t) = -9 + 9e^t, then we have y = e^u and dy/dt = e^u * du/dt