The function is , Quadrant II.
(Definition of cosine)
Here x is negative in Quadrant ll and r is always positive,.
Using the Pythagorean theorem, To find the y.
\ (Substitute
)
\ \
Subtract 1 from each side.
Take square root each side.
\Find the six trigonometric functions.
\Substitute these values .
.
The angles are ,
,
,
,
,
.