$\left(8n+4\right):2$
$\left(a+3b+c\right)^2+\left(a+2b+c\right)^2\:-2\left(a+b+c\right)\left(a+4b+c\right)$
$4a-28=-12$
$\frac{3}{2y}-\frac{5}{4y}$
$\frac{sen^3x}{1+cos\:x}+sen\:x\:\left(cosx\right)$
$\left(8x-4\right)^4\left(7x^2+7\right)^3$
$\frac{d}{dx}\frac{2x-8}{4x-3}$
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