Q4. (a) Find the foot of perpendicular drawn from the point A(1,0,-1) to the line l: \{(x, y, z) \in \mathbb{R}^3 \mid (x, y, z) = (-1,1,0) + t(2, 1, -2), t \in \mathbb{R}\}. (b) Find the foot of perpendicular drawn from the point B(2, 1, -1) to the plane x - 2y + 2z - 5 = 0.
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