Show that the general two-dimensional stress transformation relations can be used to generate relations for the normal

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Show that the general two-dimensional stress transformation relations can be used to generate relations for the normal and shear stresses in a polar coordinate system in terms of Cartesian components:

Or =  = Tro = x + ay 2 + 0x + ay 2 2 0x - y 2 cos 20+xy sin 20 Oxycos 20-Txy sin 20 2 sin 20+ Txy cos 20

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