A.\(x = 0\)
B.\(z = 0\)
C.\(y = 0\)
D.\(x + z = 0\)

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

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

A.\(y = {x^4} - 2{x^2}\)
B.\(y =  - {x^4} + 2{x^2}\)
C.\(y =  - {x^3} + 3{x^2}\)
D.\(y = {x^3} - 2x\)

A.\(\dfrac{3}{4}\)
B.\( - 5\)
C.\( - \dfrac{7}{2}\)
D.\( - 3\)

A.\(\left( { - \infty ; - \dfrac{2}{3}} \right]\)
B.\(\left( { - \infty ;\dfrac{2}{5}} \right]\)
C.\(\left( {\dfrac{2}{5}; + \infty } \right]\)
D.\(\left[ { - \dfrac{2}{3}; + \infty } \right)\)

A.\(\dfrac{{16a}}{{225}}\)
B.\(a\log \dfrac{5}{3}\)
C.\(\ln \dfrac{5}{3}\)
D.\(\dfrac{{2a}}{{15}}\)

A.\(\sqrt {54} \)
B.\(\sqrt {58} \)
C.\(2\sqrt {10} \)
D.\(\sqrt {43} \)

A.\({90^0}\)
B.\({45^0}\)
C.\({60^0}\)
D.\({30^0}\)

A.\(3a\)
B.\(\dfrac{{\sqrt {21} }}{7}a\)
C.\(\dfrac{7}{3}a\)
D.\(\dfrac{{3\sqrt {21} }}{7}a\)