$y'=-xe^{-x+y}$
$x^{2}\left(x+2\right)-4x\left(x+2\right)+4\left(x+2\right)$
$\int x\left(x^2-5\right)^3dx$
$\int\frac{7}{\sqrt{1+\tan^2x}}dx$
$sin\left(x\right)=-\frac{5}{13}$
$( c - d ) ^ { 2 }$
$2\tan c-3=3\tan c-4$
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