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

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

A.\(1\)
B.\(3\)
C.\(0\)
D.\(2\)

A.\(48\pi \)
B.\(24\pi \sqrt 2 \)
C.\(36\pi \)
D.\(80\pi \)

A.\(\dfrac{9}{4}\)
B.\({\log _3}\dfrac{3}{2}\)
C.\({\log _2}\dfrac{2}{3}\)
D.\(\dfrac{4}{9}\)

A.\(m \in \left( { - \dfrac{3}{4};0} \right)\)
B.\(m \in \left( { - \dfrac{3}{4}; + \infty } \right)\)
C.\(m \in \left( {0; + \infty } \right)\)
D.\(m \in \left( { - \infty ;0} \right)\)

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

A.\(\left( { - \dfrac{1}{4};0} \right)\)
B.\(\left( {2;3} \right)\)
C.\(\left( {0;1} \right)\)
D.\(\left( {3; + \infty } \right)\)

A.\(5\)
B.\(11\)
C.\(9\)
D.\(7\)

A.–ω2x2.
B.–ω2x.
C.ωx.
D.ωx2.