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

A.\( - \dfrac{{{a^2} - {b^2}}}{2}\)
B.\(\dfrac{{{a^2} - {b^2}}}{2}\)
C.\(0\)
D.\(1\)

A.\(\dfrac{4}{5}\)
B.\(\dfrac{5}{4}\)
C.\(\dfrac{6}{5}\)
D.\(\dfrac{5}{3}\)

A.\(\dfrac{4}{5}\)
B.\(\dfrac{5}{4}\)
C.\(\dfrac{6}{5}\)
D.\(\dfrac{5}{3}\)

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

A.\( - \dfrac{a}{b}\)
B.\(\dfrac{a}{b}\)
C.\(1\)
D.\(\dfrac{b}{a}\)

A.\(40\)
B.\(50\)
C.\(30\)
D.\(60\)

A.24 cm.
B.24,66cm.
C.28,56cm.
D.28cm.

A.\({f_2} = \sqrt 2 {f_1}\)
B.\({f_2} = \dfrac{4}{3}{f_1}\)
C.\({f_2} = \dfrac{{\sqrt 3 }}{{2\sqrt 2 }}{f_1}\)
D.\({f_2} = \sqrt {\dfrac{2}{3}} {f_1}\)

A.14,9cm.
B.4,0cm.
C.\(4\sqrt {13} cm\)
D.8,0cm