Bài tập 4 trang 223 SGK Toán 11 NC

A. 2            B. 3             C. 1             D. Vô số

A. \(D = \mathbb{R}\backslash \left\{ {k2\pi ,k \in \mathbb{Z}} \right\}\)

B. \(D = \mathbb{R}\backslash \left\{ {\dfrac{\pi }{2} + k2\pi ,k \in \mathbb{Z}} \right\}\)

C. \(D = \mathbb{R}\backslash \left\{ {k\pi ,k \in \mathbb{Z}} \right\}\)

D. \(D = \mathbb{R}\backslash \left\{ {\dfrac{\pi }{2} + k\pi ,k \in \mathbb{Z}} \right\}\)

A. \(\left[ {0;1} \right]\)      B. \(\left( { - 1;1} \right)\)       

C. \(\left( {0;1} \right)\)      D. \(\left[ { - 1;1} \right]\)

A. \(\sin \left( {2x + \dfrac{\pi }{4}} \right) =  - \dfrac{1}{2}\)

B. \(\sin \left( {2x + \dfrac{\pi }{4}} \right) = \dfrac{1}{{\sqrt 2 }}\)

C. \(\sin \left( {2x + \dfrac{\pi }{4}} \right) =  - \dfrac{1}{{\sqrt 2 }}\)

D. \(\sin \left( {2x + \dfrac{\pi }{4}} \right) = \dfrac{1}{2}\)

A. 14          B. 48           C. 40           D. 42

A. \(\overrightarrow {M'N'}  = k\overrightarrow {MN} \) và \(M'N' =  - kMN\)

B. \(\overrightarrow {M'N'}  = k\overrightarrow {MN} \) và \(M'N' = \left| k \right|MN\)

C. \(\overrightarrow {M'N'}  = \left| k \right|\overrightarrow {MN} \) và \(M'N' = kMN\)

D. \(\overrightarrow {M'N'} //\overrightarrow {MN} \) và \(M'N' = \dfrac{1}{2}MN\)

A. 2            B. 4             C. 1             D. 3

A. \(\left\{ {\dfrac{\pi }{3} + \dfrac{{k2\pi }}{3};k \in \mathbb{Z}} \right\}\)

B. \(\left\{ { - \dfrac{\pi }{6} + \dfrac{{k2\pi }}{3};k \in \mathbb{Z}} \right\}\)

C. \(\left\{ {\dfrac{\pi }{3} + k2\pi ;k \in \mathbb{Z}} \right\}\)

D. \(\left\{ {\dfrac{\pi }{6} + \dfrac{{k2\pi }}{3};k \in \mathbb{Z}} \right\}\)

A. \(x = 35^\circ  + k180^\circ \left( {k \in \mathbb{Z}} \right)\)

B. \(x = 25^\circ  + k90^\circ \left( {k \in \mathbb{Z}} \right)\)

C. \(x = 10^\circ  + k90^\circ \left( {k \in \mathbb{Z}} \right)\)

D. \(x = \dfrac{{5\pi }}{{36}} + \dfrac{{k\pi }}{3}\left( {k \in \mathbb{Z}} \right)\)

A. \(\min y =  - 1,\max y = 2\)

B. \(\min y =  - 3,\max y =  - 1\)

C. \(\min y =  - 2,\max y = 4\)

D. \(\min y =  - 4,\max y = 2\)

A. \(\mathbb{R}\backslash \left\{ {\dfrac{\pi }{2} + k\pi ,k \in \mathbb{Z}} \right\}\)

B. \(\mathbb{R}\backslash \left\{ {k2\pi ,k \in \mathbb{Z}} \right\}\)

C. \(\mathbb{R}\backslash \left\{ {\dfrac{\pi }{2} + k2\pi ,k \in \mathbb{Z}} \right\}\)

D. \(\mathbb{R}\backslash \left\{ {\pi  + k2\pi ,k \in \mathbb{Z}} \right\}\)