If you draw the angle, then draw a line down to the x axis, you will find that your reference angle is pi/6.
tan(pi/6) should be a memory value; cot is its reciprocal. Remember that your angle is in Quadrant II.
I'm sorry, I'm still confused :s
I cannot post images here - you'll have to draw it yourself.
1. Draw the units circle, then draw the angle 5pi/6.
2. draw a line from that angle to the x axis
3. The angle of the resulting triangle is your reference angle.
Can you get that far?
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