Hi All!

I am new to this topic and not sure if it is correct place to post this.

I know simple derivative like $\displaystyle x^3-x-1$. For $\displaystyle x^3$ we multiply it by power and subtract 1 from power which is equal to $\displaystyle 3x^2$, x will become 1 and derivative of 1 is 0 so answer is

$\displaystyle 3x^2-1$

Don't know how to calculate derivative of

$\displaystyle y = \frac{1}{\sqrt{x+1}}$

Any help please?

Another thing, where to download Latex.pdf?

this link doesn't work.

Thanks in advance