$\frac{sin^2x}{tan^2x}=\frac{1+cos\:2x}{2}$
$3z+2z+z-5z$
$-\left(2m-2\right)^2$
$xy'+y=xsin\left(x^2\right)$
$6b+bx+5b$
$\lim_{x\to0}\left(\frac{2-2\sec\left(x\right)^2}{x^2}\right)$
$\frac{24a^2b^4}{6ab^4}$
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