Talk:Secant line
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Any vertical line intersects the graph of y = cos x exactly once, but is obviously not a tangent line. The line y = 1 intersects the same graph infinitely many times, and obviously is a tangent line. Therefore this childish notion of identifying the concpet of tangent line with a line that intersects a curve only once is nonsense. Michael Hardy 21:38 7 Jun 2003 (UTC)
Yes, childish...very constructive observations...Pizza Puzzle