$\left(3k-2\right)\left(5k+1\right)$
$\left(\cot\left(x\right)\right)\left(\sec\left(x\right)\right)\left(\csc^2\left(x\right)\right)\left(\sin^3\left(x\right)\right)$
$\infty-30$
$4x^2-12xn+9n^2$
$\frac{x^2-x+2}{x^2}$
$\frac{3x^3+y^3+xy^2+x^2y}{x^2y}$
$\left(p-4\right)\left(p-5\right)$
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