verify sin4 x- sin2x = cos4x – cos2x is an identity

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Apool measures 12.3 feet by 16.6 feet. if the longer wall of the pool has a diagonal of 17.8 feet, what is the volume of the pool? (round to nearest tenth)

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers