$-x^2-13x$
$4tan\left(x\right)-7=3tan\left(x\right)-6$
$\cos a\sec a=1$
$-4\:+\:5n\:-7n\:+\:8$
$4r^2+12r-16$
$\int\left(9x+5\right)^2dx$
$x^3-x^2-x+1$
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