$\left(3x+50\right)\left(x-80\right)$
$2a^4b^3-a^2b^3$
$81-4y^2$
$\frac{2}{1+cosx}-tan^2\left(\frac{x}{2}\right)=1$
$\frac{x}{y}=4$
$\:\left(2x^2+5x-6\right)\left(2x\right)$
$cos\left(sin^{-1}\left(\frac{4}{5}\right)+cos^{-1}\left(\frac{3}{5}\right)\right)$
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