$2\frac{dy}{dt}-0,5y+2=0$
$\frac{cos2x}{sinxcosx}=\frac{1-tan^2x}{tanx}$
$\frac{16x^3-4x-2}{x+2}$
$a-4b+3c-11a+5a-4b-a+2b$
$96:-8$
$\frac{45a^8}{9a^5}$
$x^2+2x-89=0$
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