$99,9999999999999+\frac{100}{2}$
$7-6c+9c+9$
$-74+1$
$\int\frac{19}{x^2\sqrt{x^2+81}}dx$
$19-\left(-11\right)$
$csc\left(2x\right)=\frac{1}{2}sec\left(x\right)csc\left(x\right)$
$\lim_{x\to-\infty}\:\frac{x^2}{\left(x-11\right)\left(x-5\right)\left(x+1\right)}$
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