Value of A for the equation:
tan A + tan 2A + tan 3A = tan A tan 2A tan 3A is
1
\(\frac{\pi}{3}\) only
2
\(\frac{2\pi}{3}\) only
3
\(\frac{\pi}{3}, \frac{2\pi}{3}\)
4
\(\frac{5\pi}{6}\)
Value of A for the equation:
tan A + tan 2A + tan 3A = tan A tan 2A tan 3A is