$\frac{\cos\left(2a\right)-1}{2}$
$\int xcos\frac{x}{2}dx$
$\frac{125-x^3}{5-x}$
$\lim_{x\to\infty}\left(\sqrt{9x^2+8x+1}-\sqrt{9x^2-4x+3}\right)$
$\int\frac{3x+10}{2x^2+3x}dx$
$\frac{2x-3}{x+1}\ge\frac{3}{4}$
$\left(2x+3y-4z\right)\left(2x-3y+4z\right)$
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