Представить в виде произведения : tg Π/5 - tg Π/10

[latex]tg\frac{\pi}{5}-tg\frac{\pi}{10}= \frac{sin(\frac{\pi}{5}-\frac{\pi}{10})}{cos\frac{\pi}{5}\cdot cos\frac{\pi}{10}} = \frac{sin\frac{\pi}{10}}{cos\frac{\pi}{5}\cdot cos\frac{\pi}{10}} = tg\frac{\pi}{10}\cdot \frac{1}{cos\frac{\pi}{5}}=tg\frac{\pi}{10}\cdot sec\frac{\pi}{5}[/latex]