A.\( - \dfrac{1}{3}\cos 3x + C\)
B.\( - \cos 3x + C\)
C.\(\cos 3x + C\)
D.\(\dfrac{1}{3}\cos 3x + C\)

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

A.\(3\)
B.\(4\)
C.\(2\)
D.\(5\)

A.\(\pi {R^2}\)
B.\(4\pi {R^2}\)
C.\(\pi R\)
D.\(2\pi R\)

A.\(0\)
B.\(8\)
C.\(1\)
D.\(3\)

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

A.\(\overrightarrow i \left( {1;0;0} \right)\)
B.\(\overrightarrow n \left( {0;1;1} \right)\)
C.\(\overrightarrow j \left( {0;1;0} \right)\)
D.\(\overrightarrow k \left( {0;0;1} \right)\)

A.\(x = 3\)
B.\(x = 2\)
C.\(x = 4\)
D.\(x = 5\)

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

A.\(29\)
B.\(7\)
C.\(1\)
D.\(11\)