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5. Recall that a symmetric matrix A is positive definite (SPD for short) if and only if xI Ax > 0 for every nonzero vector x. 5a. Find a 2-by-2 matrix A that (1) is symmetric, (2) is not singular, and (3) has all its elements greater than zero, but (4) is not SPD. Show a nonzero vector x such that x?Ax