1. Which of the following sets constitute a subspace of R2? Why or why not? Illustrate each set, regardless if it is a subspace of R2 or not, with a picture. (a) All vectors of the form (b) All vectors of the form √ a 2+a a (T)MATE ods odines (6) TASR sdt adines (d)

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A:

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A:

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A:

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A:

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A: