=&\frac{ 2 \sin{\frac{x}{2}} \cos{\frac{x}{2}} }{ \sin^2{\frac{x}{2}} + \cos^2{\frac{x}{2}} } \ =&\frac{ \frac{1}{\cos^2{\frac{x}{2}}} \left( 2 \sin{\frac{x}{2}} \cos ...
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