Как из выражения [tex]\displaystyle -P\cos\alpha-\frac{G}{2}\cos\alpha-Q\cos\frac{\alpha}{2}[/tex] получить [tex]\displaystyle \cos^2\frac{\alpha}{2}+ \frac{Q}{2P+G} \cdot\cos\frac{\alpha}{2}-\frac{1}{2}[/tex]
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