$$\int\frac{2x+3}{x^2+2x+3}dx$$

$$\frac{dy}{dx}=\frac{ysin5x}{y-5}$$

$$81y^2-16$$

$$\lim_{x\to0}\left(\frac{x^2\cos\left(x\right)}{\sin^2\left(\frac{1}{2}x\right)}\right)$$

$$\lim_{x\to0}\left(\frac{10sin\left(14x\right)}{ln\left(14x\right)}\right)$$

$$125m^3-64n^3$$