$5-\left\{7-2-\left(1-9\right)-3+12\right\}+14$

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

$\sqrt{15x-3}^{\sqrt{5}}$

$x-63=17$

$sin\left(x\right)+x+sin\left(x\right)$

$\int\frac{x^2+x+3}{x^2+6x+9}dx$

$\left(\frac{1}{2}a+b\right)\cdot\left(\frac{1}{2}a-b\right)$