$\int\frac{u^2}{\:\left(u+2\right)\left(u+1\right)}dx$
$2a^4\cdot4a$
$2a+3b=7$
$-993+-774$
$\lim_{x\to0}\left(\frac{\log\left(3+x\right)-\log\left(3\right)}{x}\right)$
$\int_{-\pi}^0\left(\pi^2\right)dx$
$-\sin^2x-\cos^2x$
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