Determine which subsets are subspaces of M 2x2 (R) and proveyour answer.
a. W = {A ? M 2x2 (R) | a12 = -a21}
b. W = {A ? M 2X2 (R) | a12 = 1}
c. Fix B ? M 2x2 (R). Let W ={ A ? M 2x2 (R) | AB = BA
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