$\frac{y:81}{43}$

$\lim_{x\to1}\left(\frac{4^x-4}{x^2-1}\right)$

$\left(+5\right)-\left(-4\right)-\left(-3\right)-\left(+5\right)+\left(-7\right)+\left(-3\right)-\left(+8\right)+\left(-2\right)$

$\frac{dy}{dx}=\frac{y+x}{3x-y}$

$\int\left(\frac{x}{sqrt\left(x^2-16\right)}\right)dx$

$\int\left(\frac{x^5}{\left(x^2+1\right)^6}\right)dx$

$8n\:=\:-n$