SOLUTION: Hello,   I apologize that I base a new article, but I need to deal with this example. I did not know council. tan(2x)cot(x) = cot(2x)tan(x) <a rel=nofollow HREF="http://w

We must rule out all values where some of those are undefined,

, or all multiples of 45°











We can divide both sides by tan(x) since tan(x) cannot be 0.



Using the + sign,





This would give an imaginary answer.

Using the - sign,






,
,

or in degrees:

, 
, 

Edwin