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Recently Referred Formulae

\purinev{4==NH$\mathrm{_2}$;6==H;2==H;1==H}
\frac{2.0 1.9}{(1.8-1.7)\times(1.6-1.5)\times(1.4-1.3)\times(1.2-1.1)}=39000
e_a
0_2
/sqrt{n}{x}