Answer:
could be used as a reference angle for
.
Step-by-step explanation:
Given the trigonometric expression

In order to find the reference angle for
, find an angle that is positive, less than
, and coterminal with
Subtract
from
.

The resulting angle of
is positive, less than
, and coterminal with
.

Since the angle
is in the fourth quadrant, subtract

Therefore,
could be used as a reference angle for
.
Keywords: reference angle
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