$\frac{7-7cos^2x}{sin^2x}$
$a^4-\:6a^2\:+\:1$
$x^2+1+8$
$\left(x-2\right)\left(x+1\right)+\left(x-2\right)\left(x+3\right)$
$\frac{9x^{2}y^{8}}{9xy^{4}}$
$x^2-25\ge0$
$-x^2-4x-4y=0$
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