Question: 3. Let L and L, be two straight lines in Euclidean space R3. Denote by P1, P2 the corresponding orthogonal projections. Prove that, in general

3. Let L and L, be two straight lines in Euclidean space R3. Denote by P1, P2 the corresponding orthogonal projections. Prove that, in general P P2 # PIPI.4. Find a geometric condition in problem 3) assuring PP, = P P

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