Use combinations of properties 1 and 2 for radicals to simplify the following expression as much as possible. Assume all variables represent positive numbers. 
Definitions:
Posterior Portions
The back parts of the body or structures situated nearer to the rear or hind end.
Cerebrospinal Fluid
The clear, colorless body fluid found in the brain and spinal cord, acting as a cushion and providing basic mechanical and immunological protection.
Cranial Cavity
The space within the skull that houses the brain, part of the dorsal body cavity.
Vertebral Canal
The cylindrical space within the vertebral column that houses and protects the spinal cord.
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