The functon is , Quadrant lV.
(Definition of cotangent)
(
)
Here x is negative in Quadrant ll and r is always positive,.
Using the Pythagorean theorem, To find the r.
\ (Pythagorean theorem)
(Substitute
)
(Evaluate powers:
)
(Add:
)
Find the six trigonometric functions.
\Substitute these values .
.
The angles are ,
,
,
,
,
.