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I'm trying to find a matrix-expression of a 30° reflection at the line $g(x)=2x+4$

Somebody can give a hint?

Greetings

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    Sorry for the bad english. With reflection I mean http://en.wikipedia.org/wiki/Reflection_(mathematics)#Reflection_across_a_line_in_the_plane and a reflection of 30° means, that g and the $x_1$-Axis intersect with 30°. Sorry again for the bad english :-(2012-06-08

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