$6o=1x+2x$
$18-4x=-2$
$\lim_{x\to0}\left(\frac{1+tan2x}{1-tan2x}\right)$
$\left(-x+1\right)+\frac{\left(x+3\right)}{\left(x+1\right)}$
$\int_{3x-5}^{36x^4-109x^2+25}dx$
$7\left(2m^2+mn\right)$
$100k^2-43k^2$
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