A.\(\dfrac{1}{3}\)
B.\( - \dfrac{3}{5}\)
C.\( - \dfrac{1}{3}\)
D.\(\dfrac{3}{5}\)

A.\( - 10\)
B.\(2\)
C.\(1\)
D.\(\dfrac{1}{4}\)

A.\(P = \dfrac{9}{{16}}\)
B.\(P = \dfrac{9}{{32}}\)  
C.\(P = \dfrac{9}{8}\)
D.\(P = \dfrac{1}{8}\)

A.\(\left| {\dfrac{{\sin 2\alpha }}{{2m}}} \right| = 2\left| m \right|\sqrt {1 - {m^2}} \)
B.\(\left| {\dfrac{{\sin 2\alpha }}{{2m}}} \right| = 2\sqrt {1 - {m^2}} \)
C.\(\left| {\dfrac{{\sin 2\alpha }}{{2m}}} \right| = \sqrt {1 - {m^2}} \)
D.\(\left| {\dfrac{{\sin 2\alpha }}{{2m}}} \right| = 2\left| m \right|\left| {1 - {m^2}} \right|\)

A.\(1\)
B.\( - \dfrac{{10}}{{11}}\)
C.\(\dfrac{5}{{12}}\)
D.\( - \dfrac{8}{{11}}\)

A.\(\dfrac{{ - 2}}{{21}}\)
B.\(\dfrac{{20}}{9}\)
C.\(\dfrac{2}{{21}}\)
D.\(\dfrac{{ - 10}}{{21}}\)

A.\(P = 12\)
B.\(P = 14\)
C.\(P = 16\)
D.\(P = 18\)

A.\(90\,\,\,\left( {c{m^2}} \right)\)
B.\(90\pi \,\,\,\left( {c{m^2}} \right)\)
C.\(70\pi \,\,\,\left( {c{m^2}} \right)\)
D.\(70\,\,\,\left( {c{m^2}} \right)\)

A.\(\dfrac{1}{{{{\left( {a + b} \right)}^2}}}\)
B.\(\dfrac{1}{{{a^2} + {b^2}}}\)
C.\(\dfrac{1}{{{{\left( {a + b} \right)}^3}}}\)
D.\(\dfrac{1}{{{a^3} + {b^3}}}\)

A.\(-a\)
B.\(a\)
C.\(-b\)
D.\(b\)