Задание 10.3

Question

Сравните с нулём:
$$1) \quad tg 	ext{ }104^{\circ};\qquad 3) \quad \sin (-36^{\circ});\qquad 5) \quad tg 	ext{ }(-291^{\circ});$$
$$2) \quad \cos 220^{\circ}; \qquad 4) \quad \cos (-78^{\circ}); \qquad 6) \quad \sin \frac{3\pi}{7}.$$

Gimli · Accepted Answer

\begin{enumerate} \item $$104^{\circ} \in ext{II ч.}\Longrightarrow \underline{tg ext{ } 104^{\circ} < 0.}$$ \item $$220^{\circ} \in ext{III ч.}\Longrightarrow \underline{\cos 220^{\circ} < 0}.$$ \item $$-36^{\circ} \in ext{IV ч.}\Longrightarrow \underline{\sin(-36^{\circ}) < 0}.$$ \item $$-78^{\circ} \in ext{IV ч.}\Longrightarrow \underline{\cos (-78^{\circ}) > 0}.$$ \item $$-291^{\circ}\in ext{I ч.}\Longrightarrow \underline{tg ext{ }(-291^{\circ}) > 0}.$$ \item $$\frac{3\pi}{7} \in ext{I ч.}\Longrightarrow \underline{\sin ext{ }\frac{3\pi}{7} > 0}.$$ \end{enumerate}

Задание 10.3

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Задание 10.3

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