87-88 - Verifying Identities Show that the following identities hold. 87. (a) ab = [(a + b)² – (a² + b²)] (b) (a² + b²)² – (a² – b²)² = 4a²b² 88. (a² + b³)(c² + d²) = (ac + bd)² + (ad – bc)² %3D

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