$2\cos\left(x\right)-4\sin\left(x\right)\cos\left(x\right)=0$
$\int_{-1}^1x^{-2}dx$
$\lim_{x\to e}\left(\frac{19\ln x-9}{x-e}\right)$
$3+2+2$
$169+26b+b^2$
$3x\left(1-8x^6\right)$
$4+y=9.5$
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