Angles in formulas

[PioneerPete]

I want to put in a formula which shows an angle multiplied by the square root of a variable. I enter the formula as ±0°0’25" * SQRT{n}. What displays in my document is ±0°0’25 * SQRT{n}. Neither the " nor square root symbol display. If I change the formula to ±0°0’25 * SQRT{n}, the square root symbol displays, but I don’t have the " in the formula.
Neither the ° or ’ cause a problem with the formula, only the ".

How am I do I enter " in an angle without screwing up the formula?

I’m using LibreOffice 4.4.0.3 on Windows 7 64 bit.

[Regina]

You need the characters PRIME (code point U+2032) and DOUBLE PRIME (code point U+2033) from the subset General Punctuation. You can insert them into a text document via Special Character dialog and copy&paste them into the formula, or you add them to the Catalog. If you need help with the Catalog look at section “Customizing the catalog” in https://wiki.documentfoundation.org/Documentation/Publications#LibreOffice_Math_Guide.

Or copy them from here 0°0′25″.