$\lim_{x\to0}\left(x\cos x-\sin x\right)$
$x^6-14x^3+49$
$\left(ab+11\right)\left(ab-11\right)$
$\left(m+7\right)\left(4-m\right)$
$\left(\frac{1}{3}a-\frac{3}{2}b\right)^2$
$\int_0^{\frac{5\sqrt{2}}{2}}\left(\frac{11x^2}{\sqrt{\left(25-x^2\right)^3}}\right)dx$
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