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

A.\(\left( { - \infty ; - 5} \right) \cup \left( {5; + \infty } \right)\) 
B.\(\left( { - \infty ; - \sqrt 5 } \right) \cup \left( {\sqrt 5 ; + \infty } \right)\)
C.\(\left( { - \infty ; - 5} \right] \cup \left[ {5; + \infty } \right)\) 
D.\(\left( { - \infty ; - \sqrt 5 } \right] \cup \left[ {\sqrt 5 ; + \infty } \right)\)

A.\(I\left( {1; - 2; - 1} \right),\,\,R = 2\)
B.\(I\left( {1; - 2; - 1} \right),\,\,R = 4\)
C.\(I\left( { - 1;2;1} \right),\,\,R = 2\)
D.\(I\left( { - 1;2;1} \right),\,\,R = 4\)

A.\(f\left( 2 \right)\)
B.\(f\left( 0 \right)\)
C.\(f\left( { - 1} \right) - \frac{3}{2}\)
D.\(f\left( 3 \right) - \frac{3}{2}\)

A.\(7\)
B.\(5\)
C.\(6\)
D.\(4\)

A.\(\frac{{{a^3}\sqrt 3 }}{6}\)
B.\(\frac{{{a^3}\sqrt 3 }}{4}\)
C.\(\frac{{{a^3}\sqrt 3 }}{3}\)
D.\(\frac{{{a^3}\sqrt 3 }}{{18}}\)

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

A.\(\frac{{x + 2}}{{ - 3}} = \frac{{y - 1}}{4} = \frac{{z + 2}}{5}\)
B.\(\frac{{x - 4}}{3} = \frac{{y - 3}}{{ - 4}} = \frac{z}{{ - 5}}\)
C.\(\frac{{x + 1}}{{ - 1}} = \frac{{y - 2}}{2} = \frac{{z - 1}}{1}\)
D.\(\frac{{x - 1}}{3} = \frac{{y - 1}}{{ - 4}} = \frac{{z - 1}}{{ - 5}}\)

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

A.\(39\)
B.\(39\pi \)
C.\(\frac{{21}}{2}\)
D.\(\frac{{21\pi }}{2}\)