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Тригонометрия (формулы приведения) (в стадии наполнения)

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Practice :: Task to Solve 41151 DIF: 1 GRP: 1

Найдите \(\displaystyle \tg (\alpha + 9\pi),\) если \(\displaystyle \tg \alpha = 0{,}4{\small .}\)

\(\displaystyle \tg (\alpha + 9\pi)=\)

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