$\infty^2-3\infty+9$
$\frac{tan\:t\:+1}{sec\:t}$
$y=x^{-8\cos\left(x\right)}$
$\left(\:5x\:-\:13\right)\:\left(\:5x\:+\:13\right)$
$60x+60=50x+90$
$6xy-3x^2$
$s^7t^6u^{-1}\:x\:s^0t^4u^{-1}$
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