Bài tập 11 trang 191 SGK Toán 10 NC

Ta có:

\(\begin{array}{*{20}{l}}
\begin{array}{l}
Ou \bot Ov\\
 \Leftrightarrow \left[ {\begin{array}{*{20}{l}}
{sd\left( {Ou,Ov} \right) = \frac{\pi }{2} + k2\pi \left( {k \in Z} \right)}\\
\begin{array}{l}
sd\left( {Ou,Ov} \right) =  - \frac{\pi }{2} + l2\pi \left( {l \in Z} \right)\\
 = \frac{\pi }{2} + \left( {2l - 1} \right)\pi 
\end{array}
\end{array}} \right.
\end{array}\\
\begin{array}{l}
 \Leftrightarrow sd\left( {Ou,Ov} \right) = \frac{\pi }{2} + m\pi \\
 = \frac{\pi }{2}\left( {1 + 2m} \right)\left( {m \in Z} \right)
\end{array}
\end{array}\)

-- Mod Toán 10 HỌC247