A.\(\cos \dfrac{\pi }{{32}}\)
B.\(\cos \dfrac{\pi }{{64}}\)
C.\(\cos \dfrac{\pi }{{16}}\)
D.\(\cos \dfrac{\pi }{8}\)

A.\(P = \dfrac{{13}}{{288}}\)
B.\(P =  - \dfrac{{13}}{{288}}\)
C.\(P = \dfrac{{11}}{{288}}\)
D.\(P =  - \dfrac{{11}}{{288}}\)

A.\(B =  - 1\)
B.\(B = 1\)
C.\(B = 0\)
D.\(B = {\sin ^2}x\)

A.\(\dfrac{{4\sqrt 3 }}{3}\)
B.\(\dfrac{{\sqrt 3 }}{3}\)
C.\(\dfrac{{2\sqrt 3 }}{3}\)
D.\(\dfrac{1}{3}\)

A.\(0\)
B.\(1\)
C.\(2\)
D.\(3\)

A.\(P = \dfrac{{5 + \sqrt 7 }}{4}\) hoặc \(P = \dfrac{{5 - \sqrt 7 }}{4}\)
B.\(P = \dfrac{{2 + \sqrt 3 }}{5}\) hoặc \(P = \dfrac{{2 - \sqrt 3 }}{5}\)
C.\(P = \dfrac{{5 + \sqrt 5 }}{7}\) hoặc \(P = \dfrac{{5 - \sqrt 5 }}{7}\)
D.\(P = \dfrac{{3 + \sqrt 2 }}{5}\) hoặc \(P = \dfrac{{3 - \sqrt 2 }}{5}\)

A.\(0\)
B.\(1\)
C.\(2\)
D.\(\dfrac{1}{2}\)

A.\(\dfrac{1}{4}\)
B.\(\dfrac{1}{{2\sqrt 2 }}\)
C.\(\dfrac{{\sqrt 2 }}{2}\)
D.\(\dfrac{{\sqrt 2 }}{3}\)

A.\(\dfrac{{12 + 2\sqrt 3 }}{{2 + \sqrt 3 }}\)
B.\(\dfrac{{12 - 2\sqrt 3 }}{{2 - \sqrt 3 }}\)
C.\(\dfrac{{12 - 2\sqrt 3 }}{{2 + \sqrt 3 }}\)
D.\(\dfrac{{12 + 2\sqrt 3 }}{{2 - \sqrt 3 }}\)

A.\(T = 1\)
B.\(T = 2\)
C.\(T = 112\)
D.\(T = 130\)