3 Let a, b c and d be real numbers. Show that ab-cd = b(a−c)+c(b-d), and deduce that |ab − cd| ≤ |b||a – c| + |c||b − d\. - Let €, K and L be positive real numbers, and suppose that |b| < K, |c| < L, \a − c\ < €/(2K), [b−d] < €/(2L). Deduce that |ab− cd| < €.

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