$\left(y-9\right)\left(y+2\right)$
$\frac{-9}{\frac{2}{5-x}}x=\frac{6x}{7-\frac{11}{2}x}$
$\sqrt{\log_{10}\left(x\right)}=\log_{10}\left(x\right)$
$1-2cos^2\:a+\cos^{4\:}a=\sin^4\:a$
$5x^3+5x^3$
$\frac{2x^3+x}{x+3}$
$-xy^{4}\cdot3yx^{3}$
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