Решите пожалуйста!
Упростить выражение
[tex]cos {}^{2} a - cos {}^{4} a + sin {}^{4} a[/tex]
[tex] \frac{tg \frac{\pi}{10} + tg \frac{3\pi}{20} }{1 - tg \frac{\pi}{10}tg \frac{3\pi}{20} } [/tex]

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