A.\(T = \dfrac{1}{{2021}}\)
B.\(T = 2021\)
C.\(T = 1\)
D.\(T = \dfrac{1}{{{{2021}^5}}}\)

A.\(2\sqrt 5  + 2\sqrt 2 \)
B.\(36\)
C.\(28\)
D.\(6\sqrt 2 \)

A.\(y = \dfrac{{2x - 3}}{{\sqrt {{x^2} + 1} }}\)
B.\(y = \dfrac{{{x^2}}}{{2x + 3}}\)
C.\(y = \dfrac{{3x + 1}}{{x + \sqrt {2{x^2} - 1} }}\)
D.\(y = \dfrac{{4x - 2}}{{{x^2} - 3x + 2}}\)

A.\(\left( {\dfrac{3}{4};\dfrac{5}{4}} \right)\)
B.\(\left( {\dfrac{1}{3};\dfrac{1}{2}} \right)\)
C.\(\left( {0;\dfrac{1}{3}} \right)\)
D.\(\left( {\dfrac{1}{2};\dfrac{3}{4}} \right)\)

A.\(F\left( {\dfrac{\pi }{6}} \right) = \dfrac{1}{2}\)
B.\(F\left( {\dfrac{\pi }{6}} \right) = \dfrac{5}{4}\)
C.\(F\left( {\dfrac{\pi }{6}} \right) = \dfrac{3}{4}\)
D.\(F\left( {\dfrac{\pi }{6}} \right) = 0\)

A.\(S = \left( { - \dfrac{1}{3};1} \right)\)
B.\(S = \left( {\dfrac{6}{7};1} \right)\)
C.\(S = \left( { - \infty ;\dfrac{6}{7}} \right)\)
D.\(S = \left( { - \dfrac{1}{3};\dfrac{6}{7}} \right)\)

A.\(\mathbb{R}\backslash \left\{ {\dfrac{1}{2};2} \right\}\)
B.\(\left( {1; + \infty } \right)\backslash \left\{ 2 \right\}\)
C.\(\left( {2; + \infty } \right)\)
D.\(\left( { - \infty ;\dfrac{1}{2}} \right) \cup \left( {2; + \infty } \right)\)

A.\(S = 6{a^2}\)
B.\(S = 4{a^2}\)
C.\(S = 8{a^2}\)
D.\(S = 10{a^2}\)

A.\(f\left( 2 \right) =  - 4\)
B.\(f\left( 2 \right) =  - 3\)
C.\(f\left( 2 \right) =  - 2\)
D.\(f\left( 2 \right) = 4\)

A.\(a + b + R = 12\)
B.\(a + b + R =  - 2\)
C.\(a + b + R = 7 + \sqrt 5 \)
D.\(a + b + R =  - 7 + \sqrt 5 \)