Nghiệm phương trình \({\rm{sinx}} + \sqrt 3 {\rm{c...

Câu hỏi: Nghiệm phương trình \({\rm{sinx}} + \sqrt 3 {\rm{cosx   =  1}}\) là:

A. \(\left[ \begin{array}{l}{\rm{x}}\,{\rm{ = }} - \frac{{\rm{\pi }}}{6}{\rm{  +  k2\pi }}\\{\rm{x}}\,{\rm{ =  }}\frac{{\rm{\pi }}}{2}{\rm{  +  k2\pi }}\end{array} \right.\left( {{\rm{k}} \in Z} \right)\)

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

C. \(\left[ \begin{array}{l}{\rm{x}}\,{\rm{ = }} - \frac{{\rm{\pi }}}{6}{\rm{  +  k\pi }}\\{\rm{x}}\,{\rm{ =  }}\frac{{\rm{\pi }}}{2}{\rm{  +  k\pi }}\end{array} \right.\left( {{\rm{k}} \in Z} \right)\)

D. \(\left[ \begin{array}{l}{\rm{x}}\,{\rm{ =  k2\pi }}\\{\rm{x}}\,{\rm{ =  }}\frac{{\rm{\pi }}}{3}{\rm{  +  k2\pi }}\end{array} \right.\left( {{\rm{k}} \in Z} \right)\)