$$y^2=7ex^2+2x$$

$$\int\left(\frac{e^{-x}\:+2}{e^{3x}}\right)dx$$

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

$$-10\left(25\right)$$

$$\lim_{x\to-\infty}\left(\frac{3x+4}{\sqrt[2]{2x^2-5}}\right)$$

$$x+4=11$$

$$\left(1-x^2\right)\frac{dy}{dx}-2y=0$$