Tìm chu kì của các hàm số sau $y = \sin \sqrt x$ 

$\left[ \begin{array}{l}x = \dfrac{\pi }{6} + k2\pi \\x = \dfrac{{5\pi }}{6} + k2\pi \end{array} \right.\left( {k \in Z} \right)$          

$\left[ \begin{array}{l}x = \dfrac{\pi }{6} + k2\pi \\x =  - \dfrac{\pi }{6} + k2\pi \end{array} \right.\left( {k \in Z} \right)$

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

$\left[ \begin{array}{l}x = \dfrac{\pi }{3} + k2\pi \\x =  - \dfrac{\pi }{3} + k2\pi \end{array} \right.\left( {k \in Z} \right)$

$0$ 

$1$ 

$2$ 

vô số

$m = 1$

Không có m

$m = 0$

Với mọi m

$A'\left( { - 2;7} \right)$ 

$A'\left( { - \dfrac{{24}}{5};\dfrac{7}{5}} \right)$ 

$A'\left( {\dfrac{{24}}{5};\dfrac{7}{5}} \right)$ 

$A'\left( {12;\dfrac{7}{5}} \right)$ 

$\left[ \begin{array}{l}x = \dfrac{\pi }{3} + k\pi \\x = \dfrac{\pi }{6} + k\pi \end{array} \right.\,\,\left( {k \in Z} \right)$

$\left[ \begin{array}{l}x = \dfrac{\pi }{3} + k2\pi \\x = \dfrac{\pi }{6} + k2\pi \end{array} \right.\,\,\left( {k \in Z} \right)$

$\left[ \begin{array}{l}x =  - \dfrac{\pi }{3} + k\pi \\x =  - \dfrac{\pi }{6} + k\pi \end{array} \right.\,\,\left( {k \in Z} \right)$

$\left[ \begin{array}{l}x =  - \dfrac{\pi }{3} + k2\pi \\x = \dfrac{\pi }{6} + k\pi \end{array} \right.\,\,\left( {k \in Z} \right)$

$R\backslash \left\{ {k\pi ,k \in Z} \right\}$

$R\backslash \left\{ {\dfrac{{k\pi }}{2},k \in Z} \right\}$

$R\backslash \left\{ {\dfrac{\pi }{2} + k\pi ,k \in Z} \right\}$

$R$