$\int\frac{1}{x\left(0.4x+2\right)}dx$
$-3b^{-2}b^4$
$\lim_{x\to0}\left(\frac{sin^2\left(7x\right)}{x^2}\right)$
$9\cot^2\theta\:-4=0$
$12x^2y^2+4xy^3$
$345x+67x-98$
$3a\:+\:b\:-\:5\:+\:4a\:-3b$
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