If ${N_a} = \{ an : n \in N \}$,then ${N_3} \cap {N_4} = $

The amplitude of a wave represented by the displacement equation $y = \frac{1}{\sqrt{a}} \sin \omega t \pm \frac{1}{\sqrt{b}} \cos \omega t$ will be

If the starting material for the manufacture of silicones is $RSiCl_{3}$,write the structure of the product formed.

$\int_0^{\pi/6} \cos^4 3\theta \cdot \sin^2 6\theta \, d\theta$ is equal to

The sum of the coefficients in the expansion of $(1+x+x^2)^n$ is

Which one of the following is most effective in causing the coagulation of an $As_2S_3$ sol?