$a^2+7a+12=0$
$b^2-18b+81$
$\frac{1}{\cos\left(x\right)}-\frac{\cos\left(x\right)}{1+\sin\left(x\right)}=\tan\left(x\right)\pi$
$8x-15\ge81$
$x\left(a+1\right)+a+1$
$\int\frac{1}{t^2-1}dx$
$\left(2ab+1\right)\left(2ab-1\right)$
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