Question 1058408
Solve the equation for 0 degrees<=x<=360 degrees. Express your answer as an exact value. 
2tanx(cosx) - 1 = 0 
--------------
tanx(cosx) = 1/2
----
Take the arctan of both sides to get:
cos(x) = 26.57 degrees or cos(x) = 180+26.57 degrees = 206.57 degrees
------------------
Comment: The cos (which is a ratio) cannot equal some number of degrees.
That does not make any sense.
Cheers,
Stan H.
------------