For each of the following linear transformations T, determine whether Tis invertible and justify your answer. (a) T: R2 R3 defined by T(a1, a2) = (a12a2, a2, 3a1 + 4a2). (c) T: R3 R3 defined by T(a1, a2, a3) = (3a12a3, a2, 3a1 + 4a2). (d) T: P3(R) P2(R) defined by T(p(x)) = p'(x).

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