Question: Using the invariance property established in the preceding problem, express the product of inertia a Ixy of an area A with respect to a pair

Using the invariance property established in the preceding problem, express the product of inertia a Ixy of an area A with respect to a pair of rectangular axes through O in terms of the moments of inertia I_x and I_y of A and the principal moments of inertia I _min and Imax of A about O. Use the formula obtained to calculate the product of inertia I _xy of the 76 × 51 × 6.4-mm angle cross section shown in Fig. 9.13B knowing that its maximum moment of inertia is 524 × 10³ mm⁴.

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