- Use L'Hopital's Rule lim of [3xcos(7x-1)]/sin(7x-7x) as x approaches 0?

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Does the Matlab variable correction-illumination require a toolbox? A car accelerates from 40km/h upto 80km/h in 50s. What is its acceleration in m/s and how far did it travel in this time? Please help. 3x^3-x^2-5x+7=0(mod 11),
find all possible x.? How to make b the subject is the question is a = 1/4 b? I set higher goals than those with whom I work.?