$-13-2\left(3b+4\right)=3\left(b+2\right)$
$\left(3t+4\right)^2$
$\frac{x^2-5x-6}{x-3}$
$\frac{cos\:x+sin\:x}{cos\:x-sin\:x}=\frac{1+sin\:2x}{cos\:2x}$
$\frac{dy}{dx}=\sqrt{x^2-2x+3}$
$-5mn+\frac{3}{4}mn$
$\left(3x^2-x+2\right)\left(x+1\right)$
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