Question

The number of points of intersection of the curve $y=\sin 3x$ with $x$-axis in the interval $(0,\pi )$ is

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

The correct option is B $2$

Drawing the graph of $y=\sin 3x$,


From the graph, we observed that there are $2$ points of intersections (i.e. $\pi /3$ and $2\pi /3$) of the curve $y=\sin 3x$ with $x$-axis in the interval $(0,\pi ).$