65–68. Improper integrals Improper integrals arise in polar coordi- nates when the radial coordinate r becomes arbitrarily large. Under certain conditions, these integrals are treated in the usual way: [B [B (b (r. 0) r dr do = lim e(r. 0) r dr do. b Use this technique to evaluate the following integrals. dA Ris the first quadrant. (1 + x? + y?)²*

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