$\lim_{x\to1}\frac{1}{1-x}-\frac{3}{1-x^3}$
$\left(x+5\right)^2-\left(x-8\right)^2$
$6x-3<12$
$\frac{2}{3}x=10$
$\frac{d}{dy}3e^{3x}\cos\left(2x\right)-2e^{3x}\sin\left(2x\right)$
$a\left(a-b\right)+b\left(a-b\right)$
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