$x^2-6x+81$
$\left(2a^2b+5\right)\left(2a^2b-5\right)$
$1440.000-400\left(5\right)^2$
$-2\left(8c-9\right)$
$9x^4-121b^8$
$-\left(-4-5+6\right)-\left(8+12-5\right)$
$\int\sec^5\left(5x\right)dx$
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