$14\cdot17$
$4.\left(x-1\right).\left(x-2\right)$
$3a^2-2ac+3e;\:a=2;\:c=3;e=3$
$9=\frac{x}{2}+4$
$10a^2-4a-6$
$cos\theta\:\left(tan\theta\:+cot\theta\:\right)=csc\theta\:$
$\frac{8}{4}\cdot2-5\left(6-7\right)-1$
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