${\displaystyle {\frac {\sqrt {x}}{3{\sqrt {x}}-{\sqrt {y}}}}={\frac {\sqrt {x}}{3{\sqrt {x}}-{\sqrt {y}}}}{\frac {(3{\sqrt {x}}-{\sqrt {y}})}{(3{\sqrt {x}}-{\sqrt {y}})}}}$

${\displaystyle (3{\sqrt {x}}-{\sqrt {y}})(3{\sqrt {x}}-{\sqrt {y}})=9x-3{\sqrt {xy}}-3{\sqrt {xy}}+y=9x-6{\sqrt {xy}}+y}$ ${\displaystyle (3{\sqrt {x}}-{\sqrt {y}})(3{\sqrt {x}}+{\sqrt {y}})=9x-3{\sqrt {xy}}+3{\sqrt {xy}}+y=9x+y}$

column1	column2	column3	column4
row1 column1	row1 column2	row1 column3	row1 column4
spanning 4 rows	leaving some of the entries blank	f	${\displaystyle \Xi (z)=\sum _{2}^{\infty }{\frac {n}{k}}\left(\cos \left({\frac {z\pi }{k}}\right)^{\alpha }\cos \left(\theta -\arccos {\frac {1}{k}}\right)^{\beta }\right)}$
something here as well	quotes make it italic	then we span two rows	here is one more entry
a	and another	filler here	and here
and now im running out of filler	so how do we span columns?	campground	and finally here
three tildes Quietly ( talk)	four tildes Quietly ( talk) 01:51, 15 June 2008 (UTC)	anything else to try?	${\displaystyle \Gamma (z)=\int _{0}^{\infty }\!t^{z-1}e^{-t}\ dt}$