$y'+3y=e^t$
$\frac{x^2+2x-35}{x-5}$
$\int\:2^{6bx}\:dx$
$\frac{\left(2x^4+2x^5-3x^3-15x^2+18\right)}{\:2x^2-3}$
$\frac{-4x-16x^2+20-6x^3}{x^2+1}$
$\lim_{x\to1}\left(\frac{sen\left(x^2\right)}{1-\cos\left(3x\right)}\right)$
$\left(b+6\right)\left(b+4\right)$
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