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9. Значения выражений \ Тип 5


\(\DeclareMathOperator{\tg}{tg}\)\(\DeclareMathOperator{\ctg}{ctg}\)\(\DeclareMathOperator{\arctg}{arctg}\)\(\DeclareMathOperator{\arcctg}{arcctg}\)
Найдите \(\tg\alpha\), если \(\cos\alpha=-\dfrac{3}{\sqrt{45}}\) и \(\alpha\in(\pi;\frac{3\pi}{2})\).