$-4\left(-2z+3\right)-8$
$\frac{1}{2}\cos\left(5x^4\right)$
$y'=8y^{-4}$
$\frac{x}{\left(x^2+1\right)^2}$
$5a\left(3a+2b\right)$
$\lim_{x\to\infty}\:\left(-2\right)^{2x+1}$
$8x^2y^2-12x^3y^3$
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