$-4m^7x+12m^5xn^2-28m^3xn^4$
$-9m-7n$
$\left(5x^2-3x+4\right):\left(x-3\right)$
$\frac{7}{8}w+5-\frac{3}{8}-4$
$\left(x+10\right)\left(x-4\right)$
$\tan\left(\frac{a}{2}\right)+\cot\left(\frac{a}{2}\right)=2\csc\left(a\right)$
$\left(x^2-1\right)\sqrt{2}x+1$
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