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[" 1.Show that "f(x)=x-6x^(2)+18x+5" is ...

[" 1.Show that "f(x)=x-6x^(2)+18x+5" is an increasing function for all "x in R" ."],[" 2.Show that the function "x^(2)-x+1" is neither increasing nor decreasing on "(0,1)],[3." Find the intervals in which the function "f(x)~~sin x-cos x,0

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