$\left(x^3y+9xy^2z\right)^2$

$14=\frac{7}{9}x$

$\lim_{x\to0}\left(\frac{\ln\left(x\right)^2}{x^2-1}\right)$

$\left(1+2y\right)dx=\left(4+x\right)dy$

$\left\{\left(tana+sina\right)-\left(tana-sina\right)\right\}^2$

$72-37,089$

$\frac{d^2}{dx^2}\left(2x^3+5x^2+2\right)$