$\cos^2\left(x\right)\cdot\tan\left(x\right)=-\frac{1}{2}$
$7x^2+10x-8$
$\frac{6x^4-15x^2-3x+10}{x-1}$
$\frac{\:2w}{w^2}$
$\left(sin^2x-3sinx+2\right)$
$6x-y=3$
$\frac{-x^2-3x+3}{x+1}$
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