Which of the following is an example of a neutral oxide?

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

If the foci of the ellipse $\frac{x^2}{16} + \frac{y^2}{b^2} = 1$ and the hyperbola $\frac{x^2}{144} - \frac{y^2}{81} = \frac{1}{25}$ are the same,then the value of $b^2$ is:

What is the figure given below showing in particular?

Photosynthetic bacteria have pigments in

The biquadratic equation,two of whose roots are $1+i$ and $1-\sqrt{2}$,is