$\lim_{x\to1}\frac{lnx}{5x-2x^2-4}$
$\frac{x^6+y^9}{x^2+y^3}$
$\left(6x\right)\left(-2x\right)$
$15sin^2x=17-7cosx$
$x+3y-2z+4-z+x+2-y$
$x^2+2y^2=c$
$v^2+8vw+16w^2$
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