On 07/06/11 15:29, luigi scarso wrote:
> 
> Log says:
> Missing character: There is no ʹ (U+02B9) in font lmroman12-regular!
> Missing character: There is no ʹ (U+02B9) in font lmroman12-regular!

And for Cambria Math:

Missing character: There is no  (U+02B9) in font cambria!
Missing character: There is no  (U+02B9) in font cambria!


Which is not surprising, since it is the wrong glyph to use
(it is a phonetic modifier, not a math symbol).

The right one is indeed U+2032 PRIME, but there the odd thing is
that all the math fonts (including Cambria Math) have a big glyph in
that slot that lives on the baseline (instead of a superscript one).

So, you need

  f^′(x) = 1

as luigi showed.

Best wishes,
Taco
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