- Let A be an n x n matrix such that A^2 + A^2 = 0. Show that (A^2 + A + I)^-1 = (A^2 - A + I)?

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Berhari-hari √41 serta melalui titik (-5,1). Buat persamaan lingkarannya!? Please help me on this math problem. Someone helped me on a similar problem, but I still couldn't get it. Photo below. Thanks.? Help, double integrals, I cant get answer:
∫[from 0 to infinity] (tan−1(5x)−tan−1(2x))/(x) dx. I got:
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