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

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

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

A.\(40\)
B.\(20\sqrt 2 \)
C.\(4\sqrt {10} \)
D.\(8\)

A.\(\left\{ \begin{array}{l}x = 2 - t\\y = 4 - 4t\\z = 4 - 2t\end{array} \right.\)
B.\(\left\{ \begin{array}{l}x = 1 + t\\y = 2 + 4t\\z = 2 + 2t\end{array} \right.\)
C.\(\left\{ \begin{array}{l}x = 1 + t\\y =  - 4t\\z = 2 + 2t\end{array} \right.\)
D.\(\left\{ \begin{array}{l}x = 1 - t\\y = 4t\\z = 2 + 2t\end{array} \right.\)

A.\(\overrightarrow {{u_3}}  = \left( {3; - 1;2} \right)\)
B.\(\overrightarrow {{u_2}}  = \left( {4;2;3} \right)\)
C.\(\overrightarrow {{u_4}}  = \left( {4; - 1;3} \right)\)
D.\(\overrightarrow {{u_1}}  = \left( {3;1;2} \right)\)

A.\(18\)
B.\(6\)
C.\(8\)
D.\(12\)

A.\(x = 4\)
B.\(x = 1\)
C.\(x =  - 1\)
D.\(x =  - 2\)

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

A.\(36\pi \)
B.\(\dfrac{{32\pi }}{3}\)
C.\(\dfrac{{8\pi }}{3}\)
D.\(16\pi \)