$$45,61\:-\:7,326\:$$

$$f\left(x\right)=\frac{x+4}{2x^2-5x-3}$$

$$\frac{dy}{dx}=2x\sqrt{y}$$

$$2a^2-7a+3$$

$$7xy\:+\:11xy\:-\:3xy$$

$$\frac{m^{3^3}-n^{3^3}}{m^3-n^3}$$

$$\lim_{x\to+\infty}\left(-\frac{in\left(x^2+1\right)}{\sqrt{x}}\right)$$