- Real Analysis about Lebesque Integration?

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In ecology a frog eating insects on the edge of a pond is called or considered its niche, community, or population? Carolina investigations for ap chemistry fundamentals of calorimetry lab answers? Prove that Sin( [π/2] - x) = cos(x)? Is this a group, according to the group axioms? (R*, ◦), where x ◦ y = πxy? Help, double integrals, I cant get answer:
∫[from 0 to infinity] (tan−1(5x)−tan−1(2x))/(x) dx. I got:
∫[from 2 to 5] (1/(1+(xy)^2)) dy.?