Posted by don on Monday, October 17, 2011 at 9:01pm.
6π/8 radians = 135°
135° is in quadrant II
The reference angle of 135° is 45°
45° is found in the 1-1-√2 right-angled triangle
In quadrant II , the sine and cosecant are positive
so
sin (6π/8) = 1/√2 , csc (6π/8) = √2
cos (6π/8) = -1/√2 , sec (6π/8) = -√2
tan (6π/8) = -1 , cot (6π/8) =-1
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