The trigonometric equation is and the interval is .
Factorize the quadratic equation.
Since the range of the inverse tangent function is ,
Obtain two solutions in the interval .
If , then the general solution is , where is an integer.
The general solutions are , where is an integer.
If , then
,
If , then
,
If , then
.
Thus, the solutions are , ,
and in the interval .
The solutions are , ,
and in the interval .
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