$4\left(-2b^2-2b+3\right)$
$\tan\frac{3\pi}{5}\:x-\sqrt{3}=0$
$\int_0^b\left(\sqrt{b^2-x^2}\right)dx$
$\lim_{x\to4}\left(\frac{x^2+12x+32}{x^2-16}\right)$
$5x+5<3x+11$
$\int\frac{3x}{-4x^2+2}dx$
$3xy^2-x^2$
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