Hi there.

Ive had a good look on the forum and cant seem to find anything to help me in this situation, just cant seem to figure this one out, here goes anyway

$\displaystyle \tan 2x = \frac{1}{3}$ where $\displaystyle \tan x = -3 \pm\sqrt{10}$

Any help with this would be really appreciated, ive been looking at it hours now and its just not making sence to me.

Ive had a look at double angle formula, but they dont seem to relate to each other.

Thanks very much