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The curve was first proposed and studied by René Descartes in 1638. [1] Its claim to fame lies in an incident in the development of calculus.Descartes challenged Pierre de Fermat to find the tangent line to the curve at an arbitrary point since Fermat had recently discovered a method for finding tangent lines.
Calculus is the mathematical study of ... The vertical and horizontal scales in this image are different. ... The slope of the tangent line to the squaring function ...
The geometrical idea of the tangent line as the limit of secant lines serves as the motivation for analytical methods that are used to find tangent lines explicitly. The question of finding the tangent line to a graph, or the tangent line problem, was one of the central questions leading to the development of calculus in the 17th
Calculus; Trigonometric substitution; Integrals (inverse functions) ... Serving a purpose similar to that of the Chebyshev method, for the tangent we can write: ...
This means that its tangent line is horizontal at every point, so the function should also be horizontal. The mean value theorem proves that this must be true: The slope between any two points on the graph of f must equal the slope of one of the tangent lines of f. All of those slopes are zero, so any line from one point on the graph to another ...
So the line y = – π /2 is a horizontal asymptote for the arctangent when x tends to –∞, and y = π /2 is a horizontal asymptote for the arctangent when x tends to +∞. Functions may lack horizontal asymptotes on either or both sides, or may have one horizontal asymptote that is the same in both directions.
The sides of this rhombus have length 1. The angle between the horizontal line and the shown diagonal is 1 / 2 (a + b).This is a geometric way to prove the particular tangent half-angle formula that says tan 1 / 2 (a + b) = (sin a + sin b) / (cos a + cos b).
Similarly, the tangent plane to a surface at a given point is the plane that "just touches" the surface at that point. The concept of a tangent is one of the most fundamental notions in differential geometry and has been extensively generalized; see Tangent space.
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