(IME) Resolva a equação a seguir, sabendo que \(a\in[0,\frac{\pi}{2})\).
\(tg\left(a \right )+tg\left(2a \right )=2tg\left(3a \right )\)
\(\left\{ 0,\frac{\pi}{3} \right \}\)
\(\left\{ 0,\frac{\pi}{2} \right \}\)
\(\left\{ \frac{\pi}{3},\frac{2\pi}{3} \right \}\)
\(\left\{ \frac{\pi}{3},\pi \right \}\)
\(\left\{ \pi,\frac{4\pi}{3} \right \}\)