The equation is $\"\"$ .

Even-Odd identity : $\"\"$ .

$\"\"$

$\"\"$ .

Solve the equation $\"\"$ .

The general solution of $\"\"$ , then $\"\"$ .

Where $\"\"$ .

Substitute $\"\"$ in $\"\"$ .

$\"\"$

Substitute $\"\"$ in $\"\"$ .

$\"\"$

Solutions for $\"\"$ in the interval $\"\"$ are $\"\"$ and $\"\"$ .