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Mathematics 12 Online
OpenStudy (frostbite):

How can I show that the function f(x)=(1/x)-(cos(x)/sin(x), ∀x∈R and x≠nπ,n∈Z, is strictly increasing on each interval (nπ,(n+1)π, if the inequality |sin(x)|<|x| is it have to be proven as well.

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