$3xy+2x-7xy+4x^2$
$\frac{\left(1-\cos\right)}{\sin}=\csc-\cot$
$\lim_{x\to7}\left(\left(x-7\right)^2\cdot\frac{e^x}{x^3-9x^2+15x-7}\right)$
$\frac{9-x^2}{3-x^2}$
$\left(\frac{7}{5}+u^3v^4\right)\left(\frac{7}{5}-u^3v^4\right)$
$\left(5m^3\:+\:2n^4\right)\:\left(25m^6-12m^3n^4+4n^8\right)$
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