$\sec^221-\cot^269+1$
$36x^4-72x^2+81$
$3-6^3$
$5x^3-6^3$
$\left(3-8\right)\left(5-\left(2\right)\right)$
$x^2+6x-2=x\left(x+8\right)$
$\int x.e^{-sx}dx$
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