$\frac{s^2+3s+8}{s^3-s^2-2s}$
$5\cot\left(x\right)+3=-2$
$n^2-14+49$
$\:cos\theta\:\cdot\:\:cot\theta\:+csc\theta\:=\frac{\left(cos^2\theta\:+1\right)}{sin\theta\:}$
$14a^7-a^7$
$\left(x^2-25\right)-2$
$1225a^4-256b^2$
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