$f+f$
$6x^2-5x-1$
$\frac{1}{1-\sec\left(x\right)}-\frac{1}{1+\sec\left(x\right)}=2\cot\left(x\right)\csc\left(x\right)$
$a^9\:-\:b^9$
$\int\frac{5x^2+5x+14}{\left(x-2\right)\left(x^2+4\right)}dx$
$\left(x+8\right)\cdot\left(x-6\right)+\left(x+4\right)^2$
$\frac{11}{2}cos^2\left(x\right)$
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