$\left(-x^2+2x\right)^2-\left(-4\sqrt{x}\right)^2$
$-\frac{1}{6}x=-5$
$5x-8x+x^3-50entre\:x+4$
$-5\left(5n-6\right)+2n$
$\frac{1+\cos a}{1-\cos a}=\left(\csc a+\cot a\right)^2$
$\int\left(z^2\right)dz$
$\lim_{x\to0}\left(\frac{sin\left(2x\right)}{1-e^{2x}}\right)$
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