For each, decide if it is a vector space, the intended operations are the natural ones. (a)
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(a) The diagonal 2 × 2 matrices
(b) This set of 2 × 2 matrices
(c) This set
(d) The set of functions {f : R †’ R | df/dx + 2f = 0}
(e) The set of functions {f : R †’ R | df/dx + 2f = 1}
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