# How to Calculate a Horizontal Tangent Line?

A horizontal tangent line is located where the derivative is zero. This is because, by definition, the derivative gives the slope of the tangent line. Horizontal lines have a slope of zero. Therefo...
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http://www.ehow.com/how_8198765_calculate-horizontal-tangent-line.html

## How to Construct a Line That Is Parallel to the Line & Tangent to the Circle?

When the ancient Greeks invented geometric construction, their number system only included the positive integers. They had no means of measuring fractional quantities, so the foundations of geomet...
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http://www.ehow.com/how_8422305_construct-parallel-line-tangent-circle.html

## How do you put Square Cubes between line , instead of horizontal line in HTML!?

See the guide here: http://www.ehow.com/how_8479650_angle-beâ€¦

http://answers.yahoo.com//question/index?qid=20120903113346AAeqGA9

## If I play a DVD on my HDTV I get a thin black horizontal line in the picture a few pixels from the top. Connecting my computer you see the line on the top bottom and sides of any video or DVD. Why?

On your TV, you have the ability to change the aspect ratio of the picture. What's happening is that you may have the aspect ratio improperly set so that the DVD's picture doesn't fill the screen, ...
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http://wiki.answers.com/Q/If_I_play_a_DVD_on_my_HDTV_I_get_a_thin_black_horizontal_line...

## How to Graph a Tangent Line?

The tangent line is one of the defining concepts in the study of calculus. The tangent line to a curve is a straight line that just touches a curve. It follows the direction of the curve at that sp...
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http://www.ehow.com/how_8396139_graph-tangent-line.html