5. Using the above inequality, and note that for any point A(x, y), B(a, b) = R², we have ||A – B|| = ||(x, y) — (a,b)|| = √√(x − a)² + (y − b)², prove that ln(1 + x² + y²), sin x + cos y, e-2²-y² are Lipschitz functions. е

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