$\left(x+9\right)\left(x-9\right)+82$
$3x^2-2x+1\:.\:x-2$
$\cos^2x-\sec^2x$
$7+6-8+15-11$
$^{x^{-2}}=81$
$\left(11b^2-4b+7\right)-\left(b^2+8b-9\right)$
$\lim_{x\to\infty}\left(\log\:\:_{x^4+e^{2x}}\left(x^2+e^x\right)\right)$
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