Troubleshooting LaTeX Code: \frac{1}{q_{2}} = \frac{A q_{1} + B}{C q_{1} + D}

[Doom of Doom]

I'm having some trouble with LaTex.

Here is the LaTex code:

\frac{1}{q_{2}} = \frac{A q_{1} + B}{C q_{1} + D}

And it should produce this:

$$\frac{1}{q_{2}} = \frac{A q_{1} + B}{C q_{1} + D}$$

Here, it's produced just fine. But in TeXnicCenter, it produces this instead:

$$1\frac{}{q_{2} = \frac{A q_{1} + B}{C q_{1} + D}}$$


What am I doing wrong?

 

[Doom of Doom]

Well, I figured it out, but I don't know why I should have to do this: I surrounded both fractions with \left. and \right. (the invisible boundaries) and it works fine now.

\left.\frac{1}{q_{2}\right.= \left.\frac{A q_{1} + B}{C q_{1} + D}\right.

$$\left.\frac{1}{q_{2}}\right.= \left.\frac{A q_{1} + B}{C q_{1} + D}\right.$$

 

[ORiONx9]

When you want to display math you should switch to math mode by enclosing the equations like the following:

\[
\frac{1}{q_2} = \frac{A q_{1} + B}{C q_{1} + D}
\]

OR

$$
\frac{1}{q_2} = \frac{A q_{1} + B}{C q_{1} + D}
$$

If you want have have math within a block of text, ie. in-line, use single $ ... $.

 

[Gokul43201]

Tagging on here, as it appears the above question has been answered (and it seemed excessive to start a new thread).

How does one correctly display the Angstrom symbol with the A correctly positioned below the circle?

The standard approach gives me this: $$\AA$$

I know there's a workaround that I've used before but can not recall.

Edit: Nevermind, got it: Mathring $$\mathring{A}$$

 

[malawi_glenn]

$$10^{-10}\text{m}= 1 \mathring{\text{A}}$$