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formula box: $$\fbox{x=\frac{1}{2}}$$ gives 

fraction:  Syntax: \frac{numerator}{denominator}
 Use font sizing commands for specific sizing if you don't want the predefined one to be taken.
 Ex. (with predefined sizing): $$f(x,y)=\frac{2a}{x+y}$$ gives
 Ex. (with specific sizing): $$f(x,y)=\frac{\fs{2}2a}{\fs{2}x+y}$$ gives
 You may nest fractions as much as you want.
 Ex. (nested fractions): $$\frac{\frac{a}{xy}+\frac{b}{x+y}}{1+\frac{ab}{a+b}}$$ gives

