This is a value of x for which $\displaystyle{\sin{{3}}}{x}={0}\usepackage{cmbright}\Huge\$ , but it is not the smallest positive value for which this is true. Look at one cycle of the graph of $\displaystyle{y}={\sin{{3}}}{x}\usepackage{cmbright}\Huge\$ just to the right of the y-axis. The function equals 0 when the graph crosses the x-axis. Find the first point to the right of the y-axis where this happens.