A.\(\dfrac{3}{{3x + 1}}\)
B.\(\dfrac{3}{{\left( {3x + 1} \right)\ln 3}}\)
C.\(\dfrac{3}{{\left( {3x + 1} \right)\ln x}}\)
D.\(\dfrac{3}{{\left( {x + 1} \right)\ln 3}}\)

A.\(T = 8\)
B.\(T = 11\)
C.\(T = \dfrac{8}{3}\)
D.\(T = \dfrac{{17}}{{15}}\)

A.\(x = 6\)
B.\(x = 8\)
C.\(x = 5\)
D.\(x = 9\)

A.\({u_6} = 6\)
B.\({u_6} = 0\)
C.\({u_6} =  - 1\)
D.\({u_6} = 1\)

A.\(V = 12\pi \,\,\left( {c{m^3}} \right)\)
B.\(V = 36\pi \,\,\left( {c{m^3}} \right)\)
C.\(V = 36\pi \,\,\left( {c{m^3}} \right)\)
D.\(V = 12\pi \,\,\left( {c{m^2}} \right)\)

A.\(4{a^3}\)
B.\({a^3}\)
C.\(8{a^3}\)
D.\(2{a^3}\sqrt 2 \)

A.\(\int {f\left( x \right)dx}  = \dfrac{1}{3}\cos 3x + C\)
B.\(\int {f\left( x \right)dx}  =  - \dfrac{1}{3}\cos 3x + C\)
C.\(\int {f\left( x \right)dx}  = 3\cos 3x + C\)
D.\(\int {f\left( x \right)dx}  =  - \cos 3x + C\)

A.\(3\)
B.\(\dfrac{4}{9}\)
C.\(9\)
D.\(\dfrac{1}{3}\)

A.\(32\)
B.\(9\)
C.\(16\)
D.\(4\)

A.\(\overline z  = 4 - 2i\)
B.\(\overline z  = 4 + 2i\)
C.\(\overline z  =  - 2 + 4i\)
D.\(\overline z  = 2 + 4i\)