$11a+11a$
$10^2\cdot3.14$
$\int\frac{\cot\left(x\right)}{\cot^2\left(x\right)-1}dx$
$\left(y+7\right)\left(y-8\right)$
$\frac{d}{dx}\frac{x^2}{4}+\frac{y^2}{9}=1$
$\int\left(\frac{-3x}{\sqrt{25x^2+26}}\right)dx$
$72+\infty$
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