(a)
\The trigonometric function value is
.
Then
is the quadrant
.
Find
value.

From the pythogarean theroem,
\

Since,
is quadrant
is positive and
is negative.
Hence, 
The value of 
(b)
\The trigonometric function value is
.
Then
is the quadrant
.
Find
value.

From the Pythagorean theorem,
\

Since,
is the quadrant
, then
is positive and
is negative.

The value of 
(c)
\The trigonometric function value is
.
Then
is inquadrant
.
Find
value.

From the Pythagorean theorem,
\

Since,
is in quadrant
, then
is positive and
are negative.

The value of 
(d)
\The trigonometric function value is
.
Then
is inquadrant
.
Find
value.

From the Pythagorean theorem,
\

Since,
is the quadrant
, then
is positive and
is negative.

The value of 