$\left(1+x^2+y^2+x^2\:y^2\right)dy=\left(1+y^2\right)dx$
$1290x^2-72x+81$
$x^2-25x=\left(x+5\right)\left(x-5\right)$
$\lim_{x\to0}\left(1+\frac{x}{n}\right)^{3n}$
$a^2-20a$
$5x^3+2x+3-x+3$
$h\left(t\right)=\frac{4t+10}{t^2-2t-15}$
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