$\left(a+b\right)^2=8$

$\left(x^{5}-2x+b\right):\left(x^{2}-4\right)$

$\lim_{x\to5}\left(\frac{\cos\left(xt\right)-cos\left(5t\right)}{25-x^2}\right)$

$\lim_{x\to\infty}\:\frac{x^2}{\left(x-11\right)\left(x-5\right)\left(x+1\right)}$

$1.01+\left(-1.0001\right)-\left(-1.101\right)$

$681,12-85,007$

$-2\cdot9-4$