Question: "If $\tan A = \frac{1}{7}$ and $\tan B = \frac{1}{3}$, what is the value of $\cos(2A)$?" | TestX

Loading Question: "If $\tan A = \frac{1}{7}$ and $\tan B = \frac{1}{3}$, what is the value of $\cos(2A)$?" | TestX...