In geometry, the tangent line (or simply the tangent) to a curve at a given point is the straight line that "just touches" the curve at that point. As it passes through the point of tangency, the tangent line is "going in the same direction" as the curve, and in this sense it is the best straight-line approximation to the curve at that point.

In a similar way, the tangent plane to a surface at a given point is the plane that "just touches" the surface at that point.

In a similar way, the tangent plane to a surface at a given point is the plane that "just touches" the surface at that point.

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Determining Points At Which Function Has Horizontal Tangent Line

**Video Clip Length:** 11 minutes 55 seconds

**Video Clip Views:** 21447

Determining Points At Which Function Has Horizontal Tangent Line 2

**Video Clip Length:** 3 minutes 26 seconds

**Video Clip Views:** 12960

Finding The Tangent Line Of A Function 5

**Video Clip Length:** 2 minutes 13 seconds

**Video Clip Views:** 8065

Tangent Line

Find the equation of the line that is tangent to the graph of f(x) = 3x4 - 5x2 + 145 at the point (2...

Find the equation of the line that is tangent to the graph of f(x) = 3x4 - 5x2 + 145 at the point (2...

BC is tangent to A at B and to D at C (not

drawn to scale). If AB = 12 , BC = 18, and

DC = 3, find the length of ...

drawn to scale). If AB = 12 , BC = 18, and

DC = 3, find the length of ...

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