$4n^42n^{-3}$
$\left(2x-2\right)\cdot\left(3x+3\right)$
$3-2\left(-5\right)\left(2+3\left(-4+3\right)\right)$
$\int sin\left(x\right)\cdot\cos\left(kx\right)dx$
$\lim_{x\to0}\left(\frac{x-ln\left(1+x\right)}{cosx-1}\right)$
$\frac{x^3-3x^2+2x^2}{2x-\frac{1}{2}}$
$\frac{63x^6y^2z^3}{81x^5y^4z^3}$
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