$-71a^3b-84a^4b^2-50a^3b+84a^2b^2-45a^3b+18a^3b$
$\frac{14x+7}{x^2+x-6}$
$4x^2+8x+5=0$
$\frac{2t^3\left(2t+1\right)}{\left(1-6t^2\right)}$
$x+6+1-5x$
$sec^2\theta\:+sec\theta\:\:tan\theta\:$
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