ĐGNL ĐHQG Hà Nội - Tư duy định lượng - Phương trình lượng giác thường gặp

A.\(\left[ {\begin{array}{*{20}{c}}{x = \frac{{k\pi }}{2}}\\{x = \pm \frac{1}{2}arccos( - \frac{1}{6}) + k\pi }\end{array}} \right.(k \in Z)\)

B. \(\left[ {\begin{array}{*{20}{c}}{x = \frac{{k\pi }}{2}}\\{x = \pm \frac{5}{2}arccos( - \frac{1}{6}) + k\pi }\end{array}} \right.(k \in Z)\)

C. \(\left[ {\begin{array}{*{20}{c}}{x = \frac{{k\pi }}{2}}\\{x = \pm \frac{1}{2}arccos( - \frac{1}{3}) + k\pi }\end{array}} \right.(k \in Z)\)

D. \(\left[ {\begin{array}{*{20}{c}}{x = \frac{{k\pi }}{2}}\\{x = \pm \frac{1}{3}arccos( - \frac{1}{6}) + k\pi }\end{array}} \right.(k \in Z)\)

A.\[\left| a \right| \ge 1\]

B. \[\left| a \right| >1\]

C. \[\left| a \right| = 1\]

D. \[\left| a \right| \ne 1\]

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

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

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

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

A.\(\left[ {\begin{array}{*{20}{c}}{x = \frac{\pi }{3} + k\pi }\\{x = \frac{\pi }{6} + k\pi }\end{array}} \right.(k \in Z)\)

B. \(\left[ {\begin{array}{*{20}{c}}{x = \frac{\pi }{3} + k2\pi }\\{x = \frac{\pi }{6} + k2\pi }\end{array}} \right.(k \in Z)\)

C. \(\left[ {\begin{array}{*{20}{c}}{x = - \frac{\pi }{3} + k\pi }\\{x = - \frac{\pi }{6} + k\pi }\end{array}} \right.(k \in Z)\)

D. \(\left[ {\begin{array}{*{20}{c}}{x = - \frac{\pi }{3} + k2\pi }\\{x = \frac{\pi }{6} + k\pi }\end{array}} \right.(k \in Z)\)

A.\[x = - \frac{\pi }{6} + k2\pi \,\,\,\left( {k \in Z} \right)\]

B. \[x = \frac{\pi }{6} + \frac{{k2\pi }}{3}\,\,\,\left( {k \in Z} \right)\]

C. \[x = - \frac{\pi }{6} + \frac{{k2\pi }}{3}\,\,\,\left( {k \in Z} \right)\]

D. \[x = \pm \frac{\pi }{6} + \frac{{k2\pi }}{3}\,\,\,\left( {k \in Z} \right)\]

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

B. \[x = \pm \frac{\pi }{6} + k2\pi \,\,\left( {k \in Z} \right)\]

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

D. \(\left[ {\begin{array}{*{20}{c}}{x = \frac{\pi }{6} + k\pi \,\,\left( {k \in Z} \right)}\\{x = \frac{\pi }{3} + k\pi \,\,\left( {k \in Z} \right)}\end{array}} \right.\)

A.0     

B.1     

C.2      

D.4

A.m=1

B.Không có m

C.m=0

D.Với mọi m

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

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

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

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

A.Có 1 họ nghiệm

B.Có 2 họ nghiệm

C.Vô nghiệm     

D.Có 1 nghiệm duy nhất

A.\[ - \frac{{5{\pi ^2}}}{{12}}\]

B. \[ - \frac{{5{\pi ^2}}}{{144}}\]

C. \[\frac{{5{\pi ^2}}}{{144}}\]

D. \[\frac{{{\pi ^2}}}{{12}}\]

A.0     

B.1

C.2

D.3

A.\[\frac{{3\pi }}{5}\]

B. \[\frac{{29\pi }}{{30}}\]

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

D. \[\frac{{23\pi }}{{30}}\]

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

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

C. \[x = \frac{\pi }{6} + k2\pi \,\,\left( {k \in \mathbb{Z}} \right)\]

D. Tất cả đều đúng.

A.\(\left[ {\begin{array}{*{20}{c}}{x = \frac{\pi }{2} + k\pi }\\{x = \frac{\pi }{6} + k\pi }\end{array}} \right.(k \in Z)\)

B. \(\left[ {\begin{array}{*{20}{c}}{x = \frac{\pi }{4} + k\pi }\\{x = \frac{\pi }{3} + k\pi }\end{array}} \right.(k \in Z)\)

C. \(\left[ {\begin{array}{*{20}{c}}{x = \frac{\pi }{8} + k2\pi }\\{x = \frac{\pi }{{12}} + k2\pi }\end{array}} \right.(k \in Z)\)

D. \(\left[ {\begin{array}{*{20}{c}}{x = \frac{\pi }{8} + k\pi }\\{x = \frac{\pi }{{12}} + k\pi }\end{array}} \right.(k \in Z)\)

A.Ba nghiệm      

B.Một nghiệm     

C.Hai nghiệm

D.Bốn nghiệm

A.0

B.1     

C.2

D.3

A.9

B.3

C.6

D.7

A.\[m \ne \frac{1}{2}\]

B. \[m = \frac{1}{2}\]

C. \(\left\{ {\begin{array}{*{20}{c}}{\frac{1}{3} < m < 1}\\{m \ne \frac{1}{2}}\end{array}} \right.\)

</>

D. \[\frac{1}{3} < m < 1\]

</>

A.\[x = \frac{\pi }{9} + \frac{{k2\pi }}{3};\left( {k \in \mathbb{Z}} \right)\]

B. \[x = \frac{\pi }{{18}} + \frac{{k\pi }}{6};\left( {k \in \mathbb{Z}} \right)\]

C. \[x = \pm \frac{\pi }{6} + \frac{{k\pi }}{2}\,\,\left( {k \in \mathbb{Z}} \right)\]

D. \[x = \frac{\pi }{{18}} + \frac{{k\pi }}{3};\,\,x = - \frac{\pi }{6} + \frac{{k\pi }}{2}\,\,\left( {k \in \mathbb{Z}} \right)\]

A.\[x = - \frac{\pi }{4} + k\pi ;\,\,x = \frac{\pi }{6} + k2\pi ;x = \frac{{5\pi }}{6} + k2\pi ;\,\,x = - \frac{\pi }{2} + k2\pi \left( {k \in \mathbb{Z}} \right)\]

B. \[x = \frac{\pi }{4} + k2\pi ;\,\,x = - \frac{\pi }{6} + k2\pi ;x = \frac{{5\pi }}{6} + k\pi ;\,\,x = - \frac{\pi }{2} + k\pi \left( {k \in \mathbb{Z}} \right)\]

C. \[x = \pm \frac{\pi }{6} + k2\pi ;x = \frac{{5\pi }}{6} + k2\pi ;\,\,x = - \frac{\pi }{2} + k2\pi \left( {k \in \mathbb{Z}} \right)\]

D. \[x = - \frac{\pi }{8} + k\pi ;\,\,x = \frac{\pi }{6} + k\pi ;x = - \frac{{5\pi }}{6} + \frac{{k\pi }}{6};\,\,x = - \frac{\pi }{2} + \frac{{k\pi }}{6}\left( {k \in \mathbb{Z}} \right)\]

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

B. \[x = \frac{{2\pi }}{3} + 2k\pi \,\,\left( {k \in \mathbb{Z}} \right)\]

C. \[x = \frac{\pi }{3} + 2k\pi \,\,\left( {k \in \mathbb{Z}} \right)\]

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

A.\[x = \frac{{n\pi }}{2};\,\,x = \frac{\pi }{{20}} + \frac{{k\pi }}{{13}}\,\,\left( {k,\,\,n \in \mathbb{Z}} \right)\]

B. \[x = n\pi ;\,\,x = \frac{\pi }{{20}} + \frac{{k\pi }}{{10}}\,\,\left( {k,\,\,n \in \mathbb{Z}} \right)\]

C. \[x = n\pi ;\,\,x = \frac{{3\pi }}{5} + \frac{{2k\pi }}{7}\,\,\left( {k,\,\,n \in \mathbb{Z}} \right)\]

D. \[x = n\pi ;\,\,x = \frac{{3\pi }}{5} + \frac{{7k\pi }}{{13}}\,\,\left( {k,\,\,n \in \mathbb{Z}} \right)\]

A.\[x = \pm \frac{\pi }{3} + k2\pi ;\,\,x = \frac{{2\pi }}{3} + k2\pi \,\,\left( {k \in \mathbb{Z}} \right)\]

B. \[x = \frac{\pi }{4} + k\pi ;\,\,x = \frac{\pi }{6} + k\pi \,\,\left( {k \in \mathbb{Z}} \right)\]

C. \[x = k\pi ;\,\,x = \frac{\pi }{3} + k2\pi ;\,\,x = \frac{{2\pi }}{3} + k2\pi \,\,\left( {k \in \mathbb{Z}} \right)\]

D. \[x = \frac{\pi }{2} + k\pi ;\,\,x = \frac{\pi }{6} + \frac{{k\pi }}{3}\,\,\left( {k \in \mathbb{Z}} \right)\]

A.\[x = \frac{{k\pi }}{{18}};\,\,x = \frac{{k\pi }}{{22}}\,\,\left( {k \in \mathbb{Z}} \right)\]

B. \[x = \frac{{k\pi }}{9};\,\,x = \frac{\pi }{{44}} + \frac{{k\pi }}{{22}}\,\,\left( {k \in \mathbb{Z}} \right)\]

C. \[x = \frac{\pi }{3} + \frac{{k\pi }}{{18}};\,\,x = \frac{\pi }{{22}} + \frac{{k\pi }}{{22}}\,\,\left( {k \in \mathbb{Z}} \right)\]

D. \[x = \frac{{k\pi }}{3};\,\,x = \frac{\pi }{{44}} + \frac{{k\pi }}{{44}}\,\,\left( {k \in \mathbb{Z}} \right)\]

A.\[x = k\pi ,x = \frac{\pi }{6} + \frac{{k\pi }}{3},x = \frac{\pi }{{12}} + k\pi ,x = \frac{{5\pi }}{7} + k\pi \]

B. \[x = k2\pi ,x = \frac{{7\pi }}{6} + k2\pi ,x = - \frac{\pi }{6} + k2\pi ,x = \frac{{7\pi }}{6} + k2\pi \]

C. \[x = k\pi ,x = \frac{\pi }{3} + \frac{{k2\pi }}{3},x = \frac{\pi }{{12}} + k\pi ,x = \frac{{5\pi }}{{12}} + k\pi \]

D. \[x = k2\pi ,x = \frac{\pi }{6} + \frac{{k2\pi }}{3},x = \frac{\pi }{{12}} + k\pi ,x = \frac{{7\pi }}{{12}} + k\pi \]

A.\[x = \frac{\pi }{2} + k\pi ,x = \pm \frac{1}{5}\arccos \frac{{1 + \sqrt {17} }}{8} + k\pi ,x = \pm \frac{1}{5}\arccos \frac{{1 - \sqrt {17} }}{8} + k\pi \]

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

C. \[x = \pm \frac{1}{2}\arccos \frac{{1 + \sqrt {15} }}{7} + k\pi ,x = \pm \frac{1}{2}\arccos \frac{{1 - \sqrt {15} }}{7} + k\pi \]

D. \[x = \frac{\pi }{2} + k\pi ,x = \pm \frac{1}{2}\arccos \frac{{1 + \sqrt {17} }}{8} + k\pi ,x = \pm \frac{1}{2}\arccos \frac{{1 - \sqrt {17} }}{8} + k\pi \]