Question 888808
<pre>
The smallest positive angle in the first quadrant whose tangent is 1 is 45° or
{{{pi/4}}}.  You can add 180° or {{{pi}}} to this angle as many times as you like.
That will put it in the 3rd quadrant, where the tangent is also positive if
you add an odd number times 180° or {{{pi}}}, and back into the first
quadrant if you add an even number times 180° or {{{pi}}}.

Answer: If in degrees, 45° + 180°n
        If in radians, {{{pi/4}}}{{{""+""}}}{{{pi*n}}},
        where n is any integer, positive, negative or zero.   

Edwin</pre>