Question 3 (10 points) QUESTION 3: The stress field in a body is given (in a Cartesian coordinate system x, y, z) by A₁y³ + A2x²y A3xу² + A4x²у A3xy²+ A4x²y 0 0 Asy³ 0 0 A6z³ + A7x3] Determine the necessary conditions (if any) on the constants A1, A2, A3, A4, A5, A6, A7 so that this stress field is in equilibrium in the absence of body forces.