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A \(\sqrt 3 \)

B \( - \sqrt 3 \)

C \(\dfrac{{\sqrt 3 }}{3}\)

D \( - \dfrac{{\sqrt 3 }}{3}\)

A 1

B 0

C -1

D

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A \(\sin a > 0,\,\,\cos a > 0\)

B \(\sin a < 0,\,\,\cos a < 0\)

C \(\sin a > 0,\,\,\cos a < 0\)

D

\(\sin a < 0,\,\,\cos a > 0\)

A \(\tan a > 0,\,\,\cot a > 0\)

B \(\tan a < 0,\,\,\cot a < 0\)

C \(\tan a > 0,\,\,\cot a < 0\)

D

\(\tan a < 0,\,\,\cot a > 0\)

A \(A = {\sin ^2}x\)

B \(A = {\cos ^2}x\)

C \(A =  - {\sin ^2}x\)

D \(A =  - {\cos ^2}x\)

A \( - 3 - \sqrt 3 \)

B \(2 - 3\sqrt 3 \)

C \(\dfrac{{2\sqrt 3 }}{{\sqrt 3  - 1}}\)

D

\(\dfrac{{1 - \sqrt 3 }}{{\sqrt 3 }}\)

A \(A = 2\sin x\)

B \(A = 2\cos x\)

C \(A = \sin x - \cos x\)

D \(A = 0\)

A \(\dfrac{4}{5}\)

B \( - \dfrac{4}{5}\)

C \( \pm \dfrac{4}{5}\)

D \(\dfrac{{16}}{{25}}\)

A \(\dfrac{2}{{57}}\)

B \( - \dfrac{2}{{57}}\)

C \(\dfrac{4}{{57}}\)

D \( - \dfrac{4}{{57}}\)

A \(5\)

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

C \(7\)

D \(\dfrac{7}{3}\)

A \(\sin x = 1,\,\,\cos x = 1\)

B \(\sin x = \dfrac{1}{2},\,\,\cos x = \dfrac{{ - \sqrt 3 }}{2}\)

C \(\sin x = \dfrac{1}{2};\,\,\cos x =  - \dfrac{1}{2}\)

D \(\sin x = \sqrt 3 ,\,\,\cos x = 0\)

A \(\sin \dfrac{{A + C}}{2} = \cos \dfrac{B}{2}\)

B \(\cos \dfrac{{A + C}}{2} = \sin \dfrac{B}{2}\)

C \(\sin \left( {A + B} \right) = \sin C\)

D

\(\cos \left( {A + B} \right) = \cos C\)

A 2

B -2

C 3

D -3

A \(\sin x\cos x =  - \dfrac{1}{4}\)

B \(\sin x - \cos x =  \pm \dfrac{{\sqrt 6 }}{2}\)

C \({\sin ^4}x + {\cos ^4}x = \dfrac{7}{8}\)

D \({\tan ^2}x + {\cot ^2}x = 12\)

A \(2\)

B \( - 2\)

C \(1\)

D \( - 1\)

A \(\dfrac{{\tan x + \tan y}}{{\cot x + \cot y}} = \tan x\tan y\)

B \({\left( {\sqrt {\dfrac{{1 + \sin a}}{{1 - \sin a}}}  - \sqrt {\dfrac{{1 - \sin a}}{{1 + \sin a}}} } \right)^2} = 4{\tan ^2}a\)

C \(\dfrac{{\sin a}}{{\cos a + \sin a}} - \dfrac{{\cos a}}{{\cos a - \sin a}} = \dfrac{{1 + {{\cot }^2}a}}{{1 - {{\cot }^2}a}}\)

D \(\dfrac{{\sin a + \cos a}}{{1 - \cos a}} = \dfrac{{2\cos a}}{{\sin a - \cos a + 1}}\)

A 2

B -2

C 1

D -1

A \(\dfrac{{101}}{{81}}\) hoặc \(\dfrac{{601}}{{504}}\)

B \(\dfrac{{103}}{{81}}\) hoặc \(\dfrac{{603}}{{405}}\)

C \(\dfrac{{105}}{{81}}\) hoặc \(\dfrac{{605}}{{504}}\)

D

\(\dfrac{{107}}{{81}}\) hoặc \(\dfrac{{60}}{{405}}\)

A \( - a\)

B \(a\)

C \( - b\)

D \(b\)