$mx^6-my^6$
$\left(2x^2+6x-1\right)\left(-4x^2+\frac{1}{3}x^4\right)$
$5-\left(-23\right)$
$\cos2\left(a\right)\cos\left(a\right)+\sin2\left(a\right)\cos\left(a\right)=\cos\left(a\right)$
$\int13xe^xdx$
$\lim_{n\to\infty}\left(\frac{\sqrt{2n^2-1}}{n+2}\right)$
$\lim_{x\to\pi}\left(\frac{\left(x-\pi\right)^2}{\sin^2x}\right)$
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