You can put this solution on YOUR website!
There is a positive and a negative value for
The positive solution is:
The negative solution is:
Those four angles
are the solution.
The reference angle is
for those allergic to
For each (first quadrant) reference angle there is, in each of the other quadrants, a "reflection" angle that has the same absolute value for all trigonometric functions. It is
, the reflection on the y axis, for the second quadrant. It is
, the reflection on the origin, for the third quadrant, and
if you want it positive, the reflection on the x axis, for the third quadrant.