$\frac{x^8}{a^9-x^9}$
$y^2-4y+2$
$-4x^2-4x+24$
$24xy\left(x-y\right)+5\left(x+y\right)$
$\lim_{x\to\infty}\left(\frac{e^x-1}{sin\left(9x\right)}\right)$
$\left(\frac{2}{9}z+\frac{1}{4}\right)\left(\frac{2}{9}z+\frac{1}{6}\right)$
$\frac{cosx+cos7x}{2cos3x}=cos4x$
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