b) A strain gauge rosette is mounted on a ster specimen. For a particular state of loading of the structure the strain gauge readings are:\epsi lon_(\lambda )=1200\mu (m)/(m)(0\deg ),\epsi lon_(n)=400\mu \eta m(30\deg ),\epsi lon_(C),=800\mu (m)/(m)(90\deg ). Determine principal strains, principal stresses, orientation of maximum principal strain. Take Young's modulus E=200GPa and poisson's ratio =0.25.