$\frac{-5x+10}{x^3+6x+3x-1}$
$\frac{dy}{dx}+x^2=x^2y^2$
$\left(1+\tan^2a\right)\left(\cos a\right)=\sec a$
$\frac { x ^ { 2 } + 2 x - 3 } { x - 1 }$
$x^2-2xy+y^2+y^2+yx-y^2+yx-y^2$
$sin^2\theta\:+tan^2\theta\:+cos^2\theta\:$
$x^2+4<0$
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