$\frac{d^2}{dx^2}\left(e^{x+y}\right)$

$\lim_{x\to-\infty}\left(2^x+4\right)$

$y^5-9y^3+6y^2-31-11y^4+31y^3-8y^2-19y$

$y^2\frac{dx}{dy}+\left(y+1\right)x=3y+x$

$\left(q+1\right)\left(\frac{dc}{dq}\right)=cq$

$\lim_{x\to\infty}\left(\frac{\sqrt{x+2}^2}{x+2}\right)$

$9x^6-63x^3-90x^2$