# MathJaxLaTeX help...larger bracketing symbols

#### Petrus

##### Well-known member
Hello MHB,
I am curious how I can make these "[" "]" bigger in latex cause it does not look nice when I do it. Exemple:
$$\displaystyle [3xy+\frac{3x}{3y}\ln(2)]_{\frac{x^2}{3}}^x$$
Notice just I did just type some number but how can I make it alot nicer in latex cause that does not really look good.

Regards,

#### Opalg

##### MHB Oldtimer
Staff member
Re: Latex help

Hello MHB,
I am curious how I can make these "[" "]" bigger in latex cause it does not look nice when I do it. Exemple:
$$\displaystyle [3xy+\frac{3x}{3y}\ln(2)]_{\frac{x^2}{3}}^x$$
Notice just I did just type some number but how can I make it alot nicer in latex cause that does not really look good.

Regards,
\left[ and \right] will set the size automatically: $$\displaystyle \left[3xy+\frac{3x}{3y}\ln(2)\right]_{\frac{x^2}{3}}^x$$.

Alternatively, you can set the size manually, using commands like \Bigl[ and \Bigr], which will give $$\displaystyle \Bigl[3xy+\frac{3x}{3y}\ln(2)\Bigr]_{\frac{x^2}{3}}^x$$. The available sizes, in increasing order, are \bigl and \bigr, \Bigl and \Bigr, \biggl and \biggr, \Biggl and \Biggr.

Last edited by a moderator:

#### ZaidAlyafey

##### Well-known member
MHB Math Helper
Re: Latex help

One question , can we just scale up one bracket ?

EDIT , sorry I didn't realize that Opalg already posted that .

Last edited by a moderator:

#### Petrus

##### Well-known member
Re: Latex help

Thanks evryone for the answer! I will try memorize this method Regards,

#### Evgeny.Makarov

##### Well-known member
MHB Math Scholar
Re: Latex help

\left[ and \right] will set the size automatically: $$\displaystyle \left[3xy+\frac{3x}{3y}\ln(2)\right]_{\frac{x^2}{3}}^x$$.
To add to this, there is also \middle:
$P\left(A=2\middle|\frac{A^2}{B}>4\right)$

and "If a delimiter on only one side of an expression is required, then an invisible delimiter on the other side may be denoted using a period (.)":
$\left.\frac{x^3}{3}\right|_0^1$
(Wikibooks).

#### MarkFL

Staff member
Re: Latex help

...
and "If a delimiter on only one side of an expression is required, then an invisible delimiter on the other side may be denoted using a period (.)":
$\left.\frac{x^3}{3}\right|_0^1$...
Thank you tremendously...I had encountered this problem for example with:

$$\displaystyle \frac{dy}{dx}|_{x=1}$$

where using only the \left command would not render. Now I may write:

$$\displaystyle \left.\frac{dy}{dx} \right|_{x=1}$$

Very helpful tip...most appreciated! 