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K Let f(x)=2x+12x - 30x-9. a. Find all points on the graph of f(x) at which the tangent line is horizontal. b. Find all

K Let f(x)=2x+12x - 30x-9. a. Find all points on the graph of f(x) at which the tangent line is horizontal. b. Find all points on the graph of f(x) at which the tangent line has slope - 48.

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