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A.m = −3

B.m = −2      

C.m = 0

D.m = 3

A.\[\left[ {\begin{array}{*{20}{c}}{x = \alpha + k\pi }\\{x = \pi - \alpha + k\pi }\end{array}} \right.(k \in Z)\]

B. \[\left[ {\begin{array}{*{20}{c}}{x = \alpha + k2\pi }\\{x = \pi - \alpha + k2\pi }\end{array}} \right.(k \in Z)\]

C. \[\left[ {\begin{array}{*{20}{c}}{x = \alpha + k2\pi }\\{x = - \alpha + k2\pi }\end{array}} \right.(k \in Z)\]

D. \[\left[ {\begin{array}{*{20}{c}}{x = \alpha + k\pi }\\{x = - \alpha + k\pi }\end{array}} \right.(k \in Z)\]

A.\[\sin x = - 1 \Leftrightarrow x = - \frac{\pi }{2} + k2\pi \left( {k \in Z} \right)\]

B. \[\sin x = 0 \Leftrightarrow x = k\pi \left( {k \in Z} \right)\]

C. \[\sin x = 0 \Leftrightarrow x = k2\pi \left( {k \in Z} \right)\]

D. \[\sin x = 1 \Leftrightarrow x = \frac{\pi }{2} + k2\pi \left( {k \in Z} \right)\]

A.\[x = \frac{{5\pi }}{6} + k2\pi \]

B. \[x = \frac{\pi }{6}\]

C. \[x = \frac{{5\pi }}{6}\]

D. \[x = \frac{\pi }{3}\]

A.1     

B.0      

C.3

D.2

A.\[x = \frac{\pi }{2} + k2\pi \]

B. \[x = \frac{{k\pi }}{2}\]

C. \[x = k2\pi \]

D. \[x = \frac{\pi }{6} + k2\pi \]

A.\[x = k\pi \left( {k \in Z} \right)\]

B. \[x = \frac{\pi }{2} + k2\pi \left( {k \in Z} \right)\]

C. \[x = k2\pi \left( {k \in Z} \right)\]

D. \[x = \frac{\pi }{2} + k\pi \left( {k \in Z} \right)\]

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

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

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

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

A.\(\left[ {\begin{array}{*{20}{c}}{x = \frac{\pi }{6} + k2\pi }\\{x = \frac{{5\pi }}{6} + k2\pi }\end{array}} \right.(k \in Z)\;\)

B. \(\left[ {\begin{array}{*{20}{c}}{x = \frac{\pi }{6} + k2\pi }\\{x = - \frac{\pi }{6} + k2\pi }\end{array}} \right.(k \in Z)\;\)

C. \(\left[ {\begin{array}{*{20}{c}}{x = \frac{\pi }{3} + k2\pi }\\{x = \frac{{2\pi }}{3} + k2\pi }\end{array}} \right.(k \in Z)\;\)

D. \(\left[ {\begin{array}{*{20}{c}}{x = \frac{\pi }{3} + k2\pi }\\{x = - \frac{\pi }{3} + k2\pi }\end{array}} \right.(k \in Z)\;\)

A.0                 

B.2

C.1     

D.3

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

B. \[k2\pi ;\frac{\pi }{2} + k2\pi \left( {k \in Z} \right)\]

C. \[\frac{{k\pi }}{2}\left( {k \in Z} \right)\]

D. \[k\pi ;\frac{\pi }{2} + k2\pi \left( {k \in Z} \right)\]

A.\[x = \frac{\pi }{2}\]

B. \[x = \pi \]

C. \[x = 0\]

D. \[x = - \frac{\pi }{2}\]

A.\[x = \frac{\pi }{8} + \frac{{k\pi }}{2},x = \frac{\pi }{4} + k\pi \left( {k \in Z} \right)\]

B. \[x = k2\pi ,x = \frac{\pi }{2} + k2\pi \left( {k \in Z} \right)\]

C. \[x = k\pi ,x = \frac{\pi }{4} + k\pi \left( {k \in Z} \right)\]

D. \[x = \frac{\pi }{8} + \frac{{k\pi }}{2},x = - \frac{\pi }{4} + k\pi \left( {k \in Z} \right)\]

A.\[x = \frac{\pi }{3} + k\pi \left( {k \in Z} \right)\]

B. \[x = - \frac{\pi }{3} + k2\pi \left( {k \in Z} \right)\]

C. \[x = \frac{\pi }{6} + k\pi \left( {k \in Z} \right)\]

D. \[x = - \frac{\pi }{3} + k\pi \left( {k \in Z} \right)\]

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

B. \[k\pi \left( {k \in Z} \right)\]

C. \[\pi + k2\pi \left( {k \in Z} \right)\]

D. Cả 3 đáp án đúng

A.\[x = \frac{\pi }{8} + k\pi \left( {k \in Z} \right)\]

B. \[x = \frac{\pi }{8} + \frac{{k\pi }}{5}\left( {k \in Z} \right)\]

C. \[x = \frac{\pi }{8} + \frac{{k\pi }}{4}\left( {k \in Z} \right)\]

D. \[x = \frac{\pi }{8} + \frac{{k\pi }}{2}\left( {k \in Z} \right)\]

A.\[R \setminus \left\{ {\frac{{k\pi }}{2},k \in Z} \right\}\]

B. \[R \setminus \left\{ {\frac{\pi }{2} + k\pi ,k \in Z} \right\}\]

C. R

D. \[R \setminus \left\{ {k\pi ,k \in Z} \right\}\]

A.\[x = \frac{\pi }{4} + k2\pi \left( {k \in Z} \right)\]

B. \[x = \frac{\pi }{4} + k\pi \left( {k \in Z} \right)\]

C. \[x = \frac{\pi }{4} + \frac{{k\pi }}{2}\left( {k \in Z} \right)\]

D. \[x = - \frac{\pi }{4} + k\pi \left( {k \in Z} \right)\]

A.\[x = \frac{{k\pi }}{6},\,\,x = \frac{{k\pi }}{{10}}\]

B. \[x = \frac{{k\pi }}{6},\,\,x = \frac{{k\pi }}{{20}}\]

C. \[x = \frac{{k\pi }}{3},\,\,x = \frac{{k\pi }}{{20}}\]

D. \[x = \frac{{k\pi }}{3},\,\,x = \frac{{k\pi }}{{10}}\]

A.\[x = - {30^0}\]

B. \[x = - {60^0}\]

C. \[x = {30^0}\]

D. \[x = - {60^0},\,\,x = {30^0}\]