$\frac{1-csc^2x}{cos^2x}=-csc^2x$
$3x+4-2x-6$
$-\left(x^2+4x+3\right)$
$-8-6x-1$
$9m^2-49$
$\frac{4}{x}+\frac{3}{x+6}$
$9a^2+3ab-3ab-b^2$
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