$5\cdot\left(-2w-4\right)$
$\tan^2x+\cot^2x+2$
$y=\frac{1}{2}x^2+1$
$y\left(y+16\right)\left(y+3\right)$
$\left(9x^3+y^2z\right)\left(5x^3y^4z\right)$
$\left(4x^2+1\right)\left(4x^2-3\right)$
$\frac{38}{2}$
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