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If $0 \le x < \frac{\pi}{2}$, then the number of values of $x$ for which $\sin x - \sin 2x + \sin 3x = 0$, is:
(1) 3
(2) 1
(3) 4
(4) 2
$\sin x \cos x(2\cos x - 1) = 0$
$x = 0, \frac{\pi}{3}$ in $\left[0, \frac{\pi}{2}\right)$. Number of values $= 2$.
BETA
