$\lim_{x\to0}\left(x^2\ln\left(\cos\left(\frac{1}{x}\right)\right)\right)$
$5x+10-15x=30$
$-4+2-21$
$3^2-6x+2\cdot\:5x-6$
$\int t^{-u}dt$
$\int\left(e^{\left(3x\right)}\cdot\:sen5x\right)\cdot dx$
$-12\cdot42$
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