$\left(x+y+1\right)e^xdx+\left(e^x+e^y\right)dy=0$
$x^2+x+4\ge\:0$
$3\left(8b+5\right)+b$
$4\sin\left(x\right)^2-1=4\cos\left(x\right)^2$
$\frac{dy}{dx}+\frac{y}{2}=0$
$\frac{dy}{dx}=ce^x+ce^{2x}$
$\int\:\:cos\left(x\right)sec^2\left(sen\left(x\right)\right)\:dx$
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