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4. Fundamental matrices (a) _ _ By computing the fundamental matrix, show that the matrix exponential of A: (i :3 ) is e1\": ( 1:\" 1:4; ). (b) Hence show that the solution to the non-homogeneous system of ODEs 3&2 x' = Ax-l ( 6t ) with initial condition x(0) = ( g ) is x1 = 8t3 + 6t4, x2 = 39 2t3 + 3t4