$6.2-87.23$

$-1.1k=1.21$

$\int\frac{\sqrt{x}-\ln\left(x\right)}{x}dx$

$\left(m+9\right)\left(m^2-9m+81\right)$

$3\frac{dy}{dx}=\left(x+1\right)^2$

$\lim_{x\to0}\left(\frac{\left(7sin\left(4x\right)ln\left(4x\right)\right)}{1}\right)$

$\frac{d^2}{dx^2}\left(3x^2y-2x^2y^2+y^2\right)$