Use the Figure to Find the Exact Value of the Trigonometric

Multiple Choice

Use the figure to find the exact value of the trigonometric function.​ $$\begin{array} { l } a = 12 , b = 3 \\c = 5 , d = 4\end{array}$$ ​ cos 2β
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A) ​ $\frac { 41 } { 5 }$
B) ​ $\frac { 3 } { 10 }$
C) $\frac { 9 } { 41 }$
D) ​ $\frac { 12 } { 13 }$
E) ​ $\frac { 41 } { 9 }$