admin   07-21-2012, 08:03 PM
#1
Angel
bbs   07-30-2012, 08:27 PM
#2
[latex]\sin^2x+\cos^2x=1[/latex]
admin   07-30-2012, 08:57 PM
#3
$\frac{d}{dx}\int_a^x{f(s)ds}=f(x)$
  
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