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In the below equation

$\Big(R - \left(\frac{D}{Q} \right) \Big) \Big( R - \left(\frac{D}{P} \right)\Big)$.

the \frac{D}{Q} and \frac{D}{P} have different sized parenthesis. However, if we use

$$\Big(R - \left(\frac{D}{Q} \right) \Big) \Big( R - \left(\frac{D}{P} \right)\Big)$$

they will have the same size.

What is the reason here and how we can solve the issue?

I'm using MathJax and tested the issue in LaTeX, too. When I put \displaystyle into the equation (with one dollar) it resolved but everything becomes bigger as double dollar.

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    $ places math in so-called \textstyle (for inline math), wheres $$ places math in \displaystyle, setting the equation apart from the text, and using larger notations in some cases. In LaTeX, $$ should be avoided. Use \[...\] instead or an equation environment, or one of the amsmath environments. Sep 23, 2019 at 14:53
  • @StevenB.Segletes I've updated the question, I was tough this is only LaTeX related.
    – kelalaka
    Sep 23, 2019 at 15:09
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    Anyawy, it's usually better to specify sizes with \Bigl ... \Bigr` and the like. This being said, the reason is certainly that the letter Q has a descender, which is taken into account to determine the parentheses size in the | \left ... right version.
    – Bernard
    Sep 23, 2019 at 15:13
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    It may not be relevant here, but it's worth noting that the "sized" parentheses in different fonts aren't uniformly graded, so substituting font B for font A may get different results. Sep 23, 2019 at 15:20

1 Answer 1

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The difference is due to the fact that Q has a descendant while P doesn't, so in trying to make things tighter \left and \right are able to choose a smaller size.

You can solve it with

$\Big(R - \left(\frac{D}{Q} \right) \Big) \Big( R - \left(\frac{D}{\mathstrut P} \right)\Big)$.

or a \phantom{Q} --- at leat in LaTeX. Or, better, use \bigr etc as you are doing in the external brackets.

MathJax I don't know, and it's not on topic here --- the engine is very different.

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    This solved in MathJax, too.
    – kelalaka
    Sep 23, 2019 at 15:16

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