$-4\left(-3-2\right)-\left(4-5\right)$
$\ln z\left(z-1\right)^2$
$\left(2t+5\right)^3$
$2yz+8y^2-10y-12yz$
$\frac{\left(1-\cos x\right)^{2}+\sen^{2}x}{1-\cos x}$
$-20\:\:\left(-5\right)\:-2$
$25x^2-16x^4$
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