$0,1\frac{di}{dt}+50i=30$
$\lim_{x\to-2}\left(\sqrt{\frac{x^2-4}{x^2-3x+2}}\right)$
$-2\sin\left(x\right)\cdot\cos\left(x\right)$
$-7x^2-67x-36$
$\left(5+2b+c\right)^2$
$\frac{1}{\:3\:}x=5$
$\int\frac{1}{x^2+1}+1dx$
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