$\left(3x+4b\right)^2\left(3x-4b\right)$
$\frac{1-\cos\left(x\right)^2}{\cos\left(x\right)}\csc\left(x\right)=\tan\left(x\right)$
$\frac{d}{dx}y^2+2x^2=3^{xy}$
$\lim_{x\to0}\left(\frac{cos6x\left(tan6x\right)}{x}\right)$
$\frac{x-1}{x+1}-2\le\:\:\:0$
$y^2-208y+100$
$25x^2-225$
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