$500x+y;\:x=60;\:y=20$

$x^2+20x-9$

$\int\frac{x^3}{\left(x+2\right)\left(x+2\right)}dx$

$2\left(a+b\right)^2\:-\:\frac{1}{2}\:\left(c\:+\:n\right)\:cuando\:a\:=\:3,\:b\:=\:4,\:c\:=\:\frac{1}{3},\:n\:=\:\frac{1}{4}$

$\sec\left(x\right)=\frac{13}{4}$

$5\left(-3\right)\left(-1\right)\left(3\right)$

$cot\left(a+o\right)=\frac{cota\:coto-1}{cota+coto}$