$$f(x)=\log |\sin x|$$, where $$x \in(0, \pi)$$ is strictly increasing on

The velocity of a particle at time $$t$$ is given by the relation $$v=6 t-\frac{t^2}{6}$$. Its displacement S is zero at $$\mathrm{t}=0$$, then the distance travelled in $$3 \mathrm{~sec}$$ is

The order of the differential equation whose solution is $$y=a \cos x+b \sin x+c e^{-x}$$ is

The sqaure roots of the complex number $$(-5-12 \mathrm{i})$$ are