$$\frac{2xy}{4x^2y+4x^4}$$

$$\lim_{x\to\left(\frac{\pi}{2}\right)}\left(\tan\left(x\right)\right)^{\left(\frac{\pi}{2}-x\right)}$$

$$\left(y^{2}-1\right)\frac{dy}{dx}=4xy^{2}$$

$$\frac{c+6}{2}+\frac{3}{2}=\frac{c+4}{2}$$

$$\frac{5}{\left(x-1\right)\left(x-2\right)}$$

$$-4w=-280$$