$\cos x = \frac { \sqrt { 5 } } { 3 }$ Accordingly, I. $\sin \mathrm { x }$ II. $\sin 2 x$ III. $\cos 2 x$ Which of the following values equals a rational number? A) Only I B) Only III C) I and II D) I and III E) II and III
$\cos x = \frac { \sqrt { 5 } } { 3 }$
Accordingly,\\
I. $\sin \mathrm { x }$\\
II. $\sin 2 x$\\
III. $\cos 2 x$\\
Which of the following values equals a rational number?\\
A) Only I\\
B) Only III\\
C) I and II\\
D) I and III\\
E) II and III