A.\(\dfrac{1}{{2021}}\)
B.\(\dfrac{1}{{2022}}\)
C.\(\dfrac{1}{{1011}}\)
D.\(\dfrac{2}{{2019}}\)

A.\( - \dfrac{1}{6}\)
B.\(\dfrac{3}{4}\)
C.\( - \dfrac{2}{3}\)
D.\(\dfrac{4}{5}\)

A.\(\dfrac{{a\sqrt {30} }}{6}.\)
B.\(\dfrac{{a\sqrt {66} }}{{22}}\)
C.\(\dfrac{{a\sqrt {30} }}{{10}}\)
D.\(\dfrac{{a\sqrt 2 }}{2}\)

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

A.\(\dfrac{1}{{16}}\)
B.\(\dfrac{3}{{64}}\)
C.\(\dfrac{3}{{16}}\)
D.\(\dfrac{1}{{64}}\)

A.\(\dfrac{9}{{\sqrt {173} }}\)
B.\(\dfrac{9}{{\sqrt {154} }}\)
C.\(\dfrac{{18}}{{\sqrt {173} }}\)
D.\(\dfrac{{18}}{{\sqrt {154} }}\)

A.\(1\)
B.\(3\)
C.\(2\)
D.\(4\)

A.\(2019\)
B.\(2021\)
C.\(2022\)
D.\(2020\)

A.\(0,027\)
B.\(0,015\)
C.\(0,116\)
D.\(0,067\)

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