$\frac{4x^2+24x+6}{x^2+6x+9}$
$5\cos x^23x$
$\left(x+6\right)\left(x-7\right)$
$\frac{sin\left(2x\right)}{sinx}+\frac{sinx}{tgx}=3cosx$
$\frac{2tan\left(x\right)}{1-tan^2\left(x\right)}=-1$
$3a^2+12ab-4b^2-ab$
$\left(4x-b\right)^4$
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