Prove or disprove: there is at least one straight line normal to the graph of y =
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Prove or disprove: there is at least one straight line normal to the graph of y = cosh x at a point (a, cosh a) and also normal to the graph of y = sinh x at a point (c, sinh c).
[At a point on a graph, the normal line is the perpendicular
to the tangent at that point. Also, cosh x = (ex + e¯x)/2
and sinh x = (ex - e-x)/2.]
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There is no such common normal To see this assume there is a common normal y ...View the full answer
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