$\lim_{x\to0}\left(\frac{x-\sin\left(x\right)}{3\cdot\cos\left(x\right)-3}\right)$
$-2u-5c+3+6u-c$
$4y''-6y'+7y=0$
$478-1500\cdot1$
$\int4sen^2\left(x\right)cos^2\left(x\right)dx$
$-20ab+11+6ab$
$\frac{3x^3-x+1}{x+3}$
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