$12x^2-11x+2$
$\int\frac{8}{x^2-6x+25}dx$
$\int\frac{2x+6}{x\left(x^2+7\right)}dx$
$\frac{x-3}{x}+\frac{2x+3}{x}$
$\frac{1-cos^2\:x}{cos^2\:x}=\left(\frac{sin\:x}{cos\:x}\right)$
$\left(-3mn+r\right)\left(r+3mn\right)$
$16x\:+\:11=18x-9$
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