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...The abc s of calculus volume edition solutions to exercise sets revised november set pq pr so r p with points insert word as vectors and while rs qr ps addition rule for rq q sq sr qp qs rp sp since v tan b a is in arctan radians rads isinq thus hence lies along y axis point here yes w z on other hand also that are antiparallel even though they actually negatives each x multiple must be parallel no cannot orthogonal we want this means or i e evaluating dot product get which forces note any vector look at midpoint line segment from it clear draw picture see too c solving result similar previously except replace there by...