Answer:

Explanation:
Notice that
is an angle in the fourth quadrant (where the tangent is negative), and the angle is in fact equivalent to
. This is one of the special angles for which the sine and cosine functions, as well as the tangent function have well know values:
Recall that the tangent is defined as

and for this angle (
) the value of the sine and cosine functions are well known:

Then, the tangent would be:
