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I typed instruction below into a TeX document and the fraction came out smaller than the rest of the equation. Is there any way of making the b, c and d the same size as the a?

$a = \frac{b}{c+d}$
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    inline math is designed to fit into a paragraph without changing the baseline spacing, you could use \dfrac from amsmath but if using large expressions it is better to make the whole expression a display and change $ ... $ to \[ ..\] – David Carlisle Nov 19 '14 at 13:09
  • If you want an inline fraction bigger than the default \textstyle fraction, you can use the nccmath package: it defines an \mfrac command (‘medium-sized fraction’) – about 80 % of \display style. – Bernard Nov 19 '14 at 15:03
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You can write the equation as

$a = {\displaystyle\frac{b}{c+d}}$

or, after loading amsmath,

$a = \dfrac{b}{c+d}$

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