Let G = GL2(R). {[ {[ а (a) Prove that T = | a, c, d e R, ad is a subgroup of G. d a (b) Prove that D = | a, d e R, ad + 0 is a subgroup of G. 0 d a (c) Prove that S | a, b, c, d E R, b = c} is not a subgroup of G. C d

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