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 (0 8(r. 0) r dr do = lim Ls(r. 0) r dr do. b J. Use this technique to evaluate the following integrals. w/2 (" COs 0 * cos r dr de

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