Prove the identity. 
Definitions:
Compression
This is a force or stress that reduces volume or shortens an object or material by pressing it together.
Tension
a force that stretches something, making it longer or tighter.
Shear
A strain in materials characterized by slippage along a plane or planes parallel to the imposed stress.
Confining Pressure
The pressure applied equally in all directions on a rock or sediment body usually due to the weight of overlying materials.
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