Bài tập 6.55 trang 193 SBT Toán 10

A. \(\dfrac{1}{2}\)                          

B. \( - \dfrac{1}{2}\)                          

C. -2                              

D. 2

A. 1                            

B. 2                                

C. 3                                

D. 4

A. \(\dfrac{1}{2}\)                           

B. 3                                

C. 1                                

D. \( - \dfrac{1}{2}\)

A. \(\dfrac{{11}}{2}\)                        

B. \(4\)                                

C. \(10\)                             

D. \(\dfrac{3}{2}\)

A. \(\dfrac{1}{3}\)                          

B. \(\dfrac{3}{5}\)                                

C. \(\dfrac{1}{2}\)                            

D. \(\dfrac{4}{9}\)

A. \(\dfrac{\pi }{2}\)                          

B. \(\dfrac{\pi }{3}\)                               

C. \(\dfrac{\pi }{6}\)                           

D. \(\dfrac{\pi }{4}\)

A. \(9^\circ \)                          

B. \(18^\circ \)                            

C. \(27^\circ \)

D. \(45^\circ \)

A. \(\dfrac{{1 - \sqrt 2 }}{2}\)                    

B. \(\dfrac{{1 \pm \sqrt 2 }}{2}\)                      

C. \(2\)                               

D. \(-2\)

A.\(\dfrac{{\sqrt 7 }}{4}\)                        

B.\( - \dfrac{{\sqrt 7 }}{4}\)                       

C.\( - \dfrac{{\sqrt {14} }}{4}\)                      

D.\( \pm \dfrac{{\sqrt {14} }}{4}\)

A. \( - \dfrac{4}{3}\)                          

B. \( - \dfrac{3}{4}\)                          

C. \( \pm \dfrac{4}{3}\)                          

D. Một giá trị khác

A. 1                         

B. 2    

C. 3                         

D. 4