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$$ (1 + x) / x $$
$$ d/dxf(x)=lim_(h->0)(f(x+h)-f(x))/h $$
$$ f(x)=sum_(n=0)^oo(f^((n))(a))/(n!)(x-a)^n $$
$$ << a,b >> and {:(x,y),(u,v):} $$
$$ hat(ab) bar(xy) ulA vec v dotx ddot y $$
$$ bb{AB3}.bbb(AB].cc(AB).fr{AB}.tt[AB].sf(AB) $$
$$ x/x={(1,if x!=0),(text{undefined},if x=0):} $$
$$ \triangle $$