$\frac{d}{dx}+2xy=xe^{-x^2}$
$2t^2+4t+5=0$
$\left(x+6\right)\left(x-8\right)-\left(x^2-2x-49\right)$
$y+45=30$
$\int\frac{x+1}{\left(x+2\right)\left(x-a\right)}dx$
$\sin\left(\frac{4}{7}\right)^2+\cos\left(x\right)^2=1$
$x^2-289=0$
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