A.\(4{a^3}.\)
B.\(16{a^3}.\)
C.\(\frac{8}{3}{a^3}.\)
D.\(8{a^3}.\)

A.\(\frac{{\pi .{a^3}}}{4}\).
B.\(\frac{{\pi .{a^3}}}{3}\).
C.\(\frac{{\pi .{a^3}}}{{12}}\).
D.\(\pi {a^3}\).

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

A.\(\left( {1;\,\,0;\,\,1} \right)\).
B.\(\left( {0;\,\,0;\,\, - 2} \right)\).
C.\(\left( {1;\,\,1;\,\,6} \right)\).
D.\(\left( {12;\,\,9;\,\,1} \right)\).

A.\(\frac{{a\sqrt 5 }}{5}\).
B.\(\frac{{2a\sqrt 5 }}{5}\).
C.\(\frac{{4a\sqrt 5 }}{5}\).
D.\(\frac{{3a\sqrt 5 }}{5}\).

A.\(10\,\,m/s\)
B.\(11\,\,m/s\)
C.\(12\,\,m/s\)
D.\(13\,\,m/s\)

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

A.\(\int {f\left( x \right)dx = {{\sin }^2}\frac{x}{2} + \ln x + C} \)
B.\(\int {f\left( x \right)dx = 2{{\sin }^2}2x + 2\ln x + C} \)
C.\(\int {f\left( x \right)dx = 2{{\sin }^2}\frac{x}{2} + 2\ln x + C} \)
D.\(\int {f\left( x \right)dx = 2{{\sin }^2}x + 2\ln x + C} \)

A.\(T = 6.\)
B.\(T = 12.\)
C.\(T = \sqrt 5 \).
D.\(T = 21.\)

A.\(\frac{{x - 1}}{{ - 2}} = \frac{{y - 1}}{1} = \frac{{z - 1}}{{ - 1}}.\)
B.\(\frac{{x - 1}}{2} = \frac{{y - 1}}{1} = \frac{{z - 1}}{{ - 1}}.\)
C.\(\frac{{x - 1}}{2} = \frac{{y - 1}}{1} = \frac{{z - 1}}{1}.\)
D.\(\frac{{x - 1}}{2} = \frac{{y - 1}}{{ - 1}} = \frac{{z - 1}}{{ - 1}}.\)