Bài tập 1.41 trang 40 SBT Toán 11

A. \(k2\pi \left( {k \in \mathbb{Z}} \right)\)

B. \(k2\pi ;\dfrac{\pi }{2} + k2\pi \left( {k \in \mathbb{Z}} \right)\)

C. \(\dfrac{{k\pi }}{2}\left( {k \in \mathbb{Z}} \right)\)

D. \(k\pi ;\dfrac{\pi }{2} + k2\pi \left( {k \in \mathbb{Z}} \right)\)

A. \(k\pi ,k \in \mathbb{Z}\)

B. \(\dfrac{\pi }{4} + \dfrac{{k\pi }}{2},k \in \mathbb{Z}\)

C. \(\dfrac{{k\pi }}{2},k \in \mathbb{Z}\)

D. Vô nghiệm

A. \(\cos x \ne 1 \Leftrightarrow x \ne \dfrac{\pi }{2} + k\pi \left( {k \in \mathbb{Z}} \right)\)

B. \(\cos x \ne 0 \Leftrightarrow x \ne \dfrac{\pi }{2} + k\pi \left( {k \in \mathbb{Z}} \right)\)

C. \(\cos x \ne  - 1 \Leftrightarrow x \ne  - \dfrac{\pi }{2} + k2\pi \left( {k \in \mathbb{Z}} \right)\)

D. \(\cos x \ne 0 \Leftrightarrow x \ne \dfrac{\pi }{2} + k2\pi \left( {k \in \mathbb{Z}} \right)\)

A. \(a + b = 2\).

B. \(a + b = 12\).

C. \(a + b =  - 8\).

D. \(a + b = 8\).

A. \(\left[ \begin{array}{l}x = k\dfrac{\pi }{2}\\x = \dfrac{\pi }{{20}} + k\dfrac{\pi }{{10}}\end{array} \right.\left( {k \in \mathbb{Z}} \right)\).

B. \(\left[ \begin{array}{l}x = k\pi \\x = \dfrac{\pi }{{20}} + k\dfrac{\pi }{{10}}\end{array} \right.\left( {k \in \mathbb{Z}} \right)\).

C. \(\left[ \begin{array}{l}x = \dfrac{\pi }{2} + k\dfrac{\pi }{{10}}\\x = \dfrac{\pi }{{20}} + k\dfrac{\pi }{{10}}\end{array} \right.\left( {k \in \mathbb{Z}} \right)\).

D. \(\left[ \begin{array}{l}x = k\dfrac{\pi }{2}\\x = \dfrac{\pi }{{20}} + k\dfrac{\pi }{5}\end{array} \right.\left( {k \in \mathbb{Z}} \right)\).

A. \(\left[ \begin{array}{l}x = \dfrac{\pi }{{18}} + k\dfrac{{2\pi }}{3}\\x =   \dfrac{{\pi }}{2} + k2\pi \end{array} \right.\left( {k \in \mathbb{Z}} \right)\).

B. \(\left[ \begin{array}{l}x =  - \dfrac{\pi }{4} + k\pi \\x =  - \dfrac{\pi }{{12}} + k2\pi \end{array} \right.\left( {k \in \mathbb{Z}} \right)\).

C. \(\left[ \begin{array}{l}x = \dfrac{\pi }{{12}} + k\pi \\x = \dfrac{\pi }{4} + k\pi \end{array} \right.\left( {k \in \mathbb{Z}} \right)\).

D. \(\left[ \begin{array}{l}x = \dfrac{\pi }{{12}} + k2\pi \\x =  - \dfrac{\pi }{4} + k2\pi \end{array} \right.\left( {k \in \mathbb{Z}} \right)\).

A. \(\left[ \begin{array}{l}m \ge 3\\m \le  - 3\end{array} \right.\).

B. \(\left[ \begin{array}{l}m > 3\\m <  - 3\end{array} \right.\).

C. \(\left[ \begin{array}{l}m \ge 3\\m <  - 3\end{array} \right.\).

D. \( - 3 \le m \le 3\).

A. \(m \ne 0\).

B. \(m \in R\)

C. \( - 1 \le \dfrac{{\sqrt 3 }}{m} \le 1\)

D. \( - 1 < \dfrac{{\sqrt 3 }}{m} < 1\)

A. \({\mathop{\rm s}\nolimits} {\rm{inx}} = 1\)

B. \({\mathop{\rm s}\nolimits} {\rm{inx}} =  - 1\)

C. \({\mathop{\rm t}\nolimits} {\rm{anx}} = 0\)

D. \(\cot x = 0\)