$x\frac{dy}{dx}\:-3y=x-1$
$-x^2-7x-30$
$3x^2-12x-180$
$cscx+cotx=\frac{1+cosx}{sinx}$
$\frac{y^6-81}{y^3-9}$
$-112\cdot4$
$b^{-4}.b^0$
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