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Prove or disprove the following statements: (a) Let u, w (b) Let u, w R with w0, proj(-) = - proj(v). R with w0

Prove or disprove the following statements: (a) Let u, w (b) Let u, w R" with w0, proj(-) = - proj(v). R" with w0 and c ER, perp (cv) = cperp().

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