# Thread: where to find the mathematical sign

1. ## where to find the mathematical sign

How all are able to use the following mathematical signs in this websites? How to get the signs for integration, limits, square roots etc. Kindly help me. So that I can express myself in a better way. I have just copied one of the queries I have gone through this website as an example.

img.top { vertical-align: 15%; } $\text{Calculate }\lim_{x \rightarrow -1 } \frac{\sqrt{x^2+8}-3}{x+1}$

img.top { vertical-align: 15%; } $= \frac{\sqrt{(-1)^2+8}-3}{(-1)+1}$

img.top { vertical-align: 15%; } $= \frac{0}{0 } Indeterminate$

img.top { vertical-align: 15%; } $= \lim_{x \rightarrow -1 } \frac{\sqrt{x^2+8}-3}{x+1 } \cdot \frac{\sqrt{x^2+8}+3}{\sqrt{x^2+8}+3}$

img.top { vertical-align: 15%; } $= (\sqrt{x^2+8}-3) \cdot (\sqrt{x^2+8}+3)$

img.top { vertical-align: 15%; } $= x^2 + 8 - 9$

img.top { vertical-align: 15%; } $= x^2 -1$

img.top { vertical-align: 15%; } $= (x+1) \cdot (x-1)$

img.top { vertical-align: 15%; } $= \lim_{x \rightarrow -1 } \frac{(x+1) \cdot (x-1)}{(x+1) \cdot (\sqrt{x^2+8}+3)}$

img.top { vertical-align: 15%; } $= \lim_{x \rightarrow -1 } \frac{x-1}{\sqrt{x^2+8}+3}$

img.top { vertical-align: 15%; } $= \frac{-1-1}{\sqrt{-1^2+8}+3}$

img.top { vertical-align: 15%; } $= - \frac{1}{3}$

2. ## Re: where to find the mathematical sign

Originally Posted by arangu1508
How all are able to use the following mathematical signs in this websites? How to get the signs for integration, limits, square roots etc. Kindly help me. So that I can express myself in a better way. I have just copied one of the queries I have gone through this website as an example.
You must learn to use LaTeX.

Here is an example from your own post.
[TEX]\frac{{\sqrt {x^2 + 8} - 3}}{{x + 1}}\frac{{\sqrt {x^2 + 8} + 3}}{{\sqrt {x^2 + 8} + 3}}[/TEX] gives
$\frac{{\sqrt {x^2 + 8} - 3}}{{x + 1}}\frac{{\sqrt {x^2 + 8} + 3}}{{\sqrt {x^2 + 8} + 3}}$

Thank you.