$\"\"$

\

The trigonometric equation is $\"\"$ .

\

Since the period of the tangent function is $\"\"$ , find the angles in the interval $\"\"$ .

\

There is one angle $\"\"$ for $\"\"$ : $\"\"$ .

\

The general solution of $\"\"$ is $\"\"$ , where $\"\"$ is an integer.

\

Thus, the general solution is $\"\"$ , where $\"\"$ is an integer.

\

\

If $\"\"$ , then $\"\"$ .

\

If $\"\"$ , then $\"\"$ .

\

If $\"\"$ , then $\"\"$ .

\

If $\"\"$ , then $\"\"$ .

\

If $\"\"$ , then $\"\"$ .

\

If $\"\"$ , then $\"\"$ .

\

\

The general solution set is $\"\"$ , where $\"\"$ is an integer.

\

The six solutions are $\"\"$ , $\"\"$ , $\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ .