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If I have a line segment that starts at origins and is parallel to the x-axis, how do I work out the position on the X axis of x if it is rotated by say 45 degrees?

I know the degree and I know the length of the line.. so I use what formula?

Is it cos(angle) / length?

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    I'm not sure where you're finding the thing you're referring to. In your case, you are looking for $x'$ while $x={\rm length}$ and $y=0$.2012-09-21

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http://en.wikipedia.org/wiki/Rotation_%28mathematics%29

This article provides the complete detail of your requisite

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    like is it saying... "the new position of x = cos(angle) - sin(angle) * length" ?2012-09-21