$14-3z+5z^2$

$6ad-10cd$

$\lim_{x\to0}\left(\frac{\ln\left(1+x\right)+\ln\left(1-x\right)}{x\sin\left(x\right)}\right)$

$\int\frac{5x^2+20x+6}{x^3+2x^2}dx$

$\int\cos\left(\frac{1}{2}\pi\right)dx$

$\frac{1}{3x^2}+2x^3+\frac{2}{\sqrt{x}}$

$\sqrt{\frac{72x^2}{8x^2\cdot y^7}}$