Задание 11.3

Question

Принадлежит ли графику функции $y = \cos x$ точка:
ewline
$$1) A\left( \begin{array}{rc1}{-\frac{\pi}{2}; -1}\end{array}ight); \qquad 2) B(\frac{9\pi}{4}; \frac{\sqrt{2}}{2}); \qquad 3) C(-4\pi; -1)?$$

Gimli · Accepted Answer

\begin{enumerate}
\item $$\cos (-\frac{\pi}{2}) = \cos \frac{\pi}{2} = 0
eq 1, \Longrightarrow 	ext{HET}$$
\item $$\cos \frac{9\pi}{4} = \cos \frac{\pi}{4} = \frac{\sqrt{2}}{2}\Longrightarrow 	ext{ДA}$$
\item $$\cos (-4\pi) = \cos 4\pi = 0 
eq -1\Longrightarrow 	ext{HET}$$
\end{enumerate}

Задание 11.3

Answers

Comments

Задание 11.3

Answers

Comments

Add answer