$8.\left(3x-2b\right)\:\left(3x+2b\right)$
$\sqrt{x}-\sqrt{x-3}=\sqrt{3}$
$\int\frac{sin\:x-cos\:x}{sin\:x+cos\:x}dx$
$\left(4x^2+19x-30\right)+\left(9x+36\right)+\left(2x-6\right)$
$-3x^2+6x+9<0$
$\frac{4}{\sqrt{x+1}+\sqrt{x-2}}$
$\lim_{x\to0}\:\left(-3x+1\right)\left(x^2+1\right)$
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