$4y^2\left(5x^2y^2\:-3x\right)$
$4a^5-2a^5+4b+b$
$\frac{x^3-x-1}{x^2-1}$
$\frac{1}{\sin\left(x\right)\cos\left(x\right)}-\frac{1}{tan\left(x\right)}$
$\lim_{n\to\infty}\left(n^3-2n^2\right)$
$10\cdot\left(-3\right)\cdot7$
$\int\frac{x^2+2x+1}{x\left(2x-1\right)\left(x-2\right)}dx$
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