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**[SOLVED] Simple Transformation**

I have a simple reflection illustraded in matric form that should be presented in geometric form:

// cos(5pi/6) sin(5pi/6) //

// sin(5pi/6) -cos(5pi/6) //

// cos(5pi/6) sin(5pi/6) //

// sin(5pi/6) -cos(5pi/6) //

(this should look like 2*2 matrix; see the file "transformation.jpg" if you want to see it prettier)

**SOLUTION**

__"This matrix represents a reflection in y = x*tan(5pi/12)".__

However,

**I do not understand why the angle is now 5pi/12 and not 5pi/6 as in the matrix.**Moreover, what is the difference if the minus sign was in the front of the other cos( ) in the left hand corner and not in the right hand corner? How would the angle differ? Please, help me.

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