The problems for Sections 2.5-2.8 involve displacements, deformations, and strain states a...

The problems for Sections 2.5-2.8 involve displacements, deformations, and strain states at a point in a structural or machine member. These quantities, as with then stress counterparts, are important in design and failure criteria.

Show that Eqs. 2.65-2.67 yield Eqs. 2.68.

 (2.65)

 (2.66)

 (2.67)

 (2.68)