$2+1+5$
$\int\left(x^2-1\right)\left(4+3x\right)dx$
$x\frac{dy}{dx}\:+2y=10x^2$
$\left(x+5\right)^2=x^2+5x+25$
$1\:+\:cos5x\:cosx\:+sen5xsenx$
$x^5-10x^4+21x^3+64x^2-268x+240$
$\frac{x^2+7x+4}{\left(x-1\right)\left(x+2\right)}=\frac{x+5}{x+2}$
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