$\left[a+b\right]^3+\left(a+b\right)^2.\left(a-b\right)$
$\frac{2-\sec^2}{\sec^2}$
$\:6x^2+10x-4$
$\frac{x^n}{3^n\left(n+1\right)}$
$-x-2x^3$
$\frac{x+1}{\:2}+\frac{x+2}{3}+\frac{x+3}{4}\ge\:\frac{77}{4}$
$\frac{16x^3y^5z^3}{4x^2y^3z^5}$
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