$\left(9x-10y\right)\left(4x-5y\right)$
$\left(4+v\right)\left(16-4v+v^2\right)$
$\frac{\sin\left(-x\right)}{-\cos\left(x\right)}$
$\frac{3x^2-6x}{x^2-7x+10}$
$h^2+2h-15$
$5\cot\left(x\right)^2+5$
$-9\:n\left(\:1\:-\:2\:n\right)$
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