A.\({120^0}\)
B.\({60^0}\)
C.\({30^0}\)  
D.\({90^0}\)

A.\(\dfrac{{\sqrt 2 {a^2}}}{3}\)
B.\(\dfrac{{2\sqrt 2 {a^2}}}{3}\)  
C.\(\dfrac{{\sqrt 2 {a^2}}}{6}\)  
D.\(\dfrac{{\sqrt 6 {a^2}}}{3}\)

A.\(\left( {1;3;0} \right)\)
B.\(\left( {1; - 3;0} \right)\)  
C.\(\left( {3;1;0} \right)\)  
D.\(\left( {2;6;0} \right)\)

A.\(\dfrac{7}{{40}}\)
B.\(\dfrac{9}{{10}}\)  
C.\(\dfrac{6}{{25}}\)  
D.\(\dfrac{{21}}{{40}}\)

A.\(12\)
B.\(11.\)  
C.\(0\)  
D.\(10\)

A.\(S = 7.\)
B.\(S = 6.\)
C.\(S = 8.\)
D.\(S = 5.\)

A.7
B.8
C.0
D.4

A.\(m >  - \dfrac{4}{{1011}}\)
B.\(m \ge  - \dfrac{4}{{3e + 2019}}\)
C.\(m >  - \dfrac{2}{{1011}}\)
D.\(m > \dfrac{{f\left( e \right)}}{{3e + 2019}}\)

A.\(0\)
B.\(1\)  
C.\(3\)  
D.\(2\)

A.1420
B.1419
C.1417
D.1418