Ok so I was absent from school yesterday because long story short I had no way to get to class b/c something happened last minute. I'm pretty sure this is easy but I keep getting the wrong answer for $\tan2x$.
Find $\sin 2x$, $\cos 2x$, and $\tan 2x$ from the given information.
$\tan x = -\frac{4}{3}$, $x$ in Quadrant II
So I used the double angle formulas and got
$\sin2x = -24/25$
$\cos2x = -7/25$
But I keep getting wrong answers for tangent (I got both $-200/27$ and $-24/7$ somehow). Can someone do a step by step guide on how to get $\tan2x$? Thank you.