4. (c) Find the determinant of the matrix A = cos 49 sin 49 5. Use Gauss-Jordan elimination to solve the system x₁ - 3x₂ = -2 3x₁ + x₂ - 2x₂ = 5 2x₁ + 2x₂ + x₂ = 4. -sin 49 cos 49

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