The stress tensor in a plane contains the following elements sigmax = 4 psi, sigmay = 6 psi, and tauxy = 2.3 psi. In a new coordinate system x'y' rotated 15 degrees counter clockwise from the original coordinate system, what is taux'y'?

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The stress tensor in a plane contains the following elements sigma<sub>x</sub> = 4 psi, sigma<sub>y</sub> = 6 psi, and tau<sub>xy</sub> = 2.3 psi. In a new coordinate system <sub>x'y'</sub> rotated 15 degrees counter clockwise from the original coordinate system, what is tau<sub>x'y'</sub>?