$\frac{2x^3-3x^2+x-5}{x^2-2}$

$3x^2+5x+6x$

$\int\left(1-sin\frac{x}{2}\right)^2cos\frac{x}{2}dx$

$4z^3+25z=20z^2$

$+7\:+\left(-5\right):\left(-7+2\right)\:-\:\left(+1-6\right)\:$

$-3-\frac{2\left(1-i\right)^7}{\left(1+i\right)^7}$

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