What is the formula of Carborundum?

The differential equation of the family $y=a e^x+b x e^x+c x^2 e^x$ of curves, where $a, b, c$ are arbitrary constants, is

In the given $(V-T)$ diagram,what is the relation between pressure $P_1$ and $P_2$?

The angle between the lines whose direction cosines are $\left(\frac{\sqrt{3}}{4}, \frac{1}{4}, \frac{\sqrt{3}}{2}\right)$ and $\left(\frac{\sqrt{3}}{4}, \frac{1}{4}, \frac{-\sqrt{3}}{2}\right)$ is:

Nerve cells do not divide because they do not have:

The length of the common chord of the circles of radii $15$ and $20$,whose centers are $25$ units of distance apart,is