$$\frac{5x^2+7x-3}{x+3}$$

$$\left(\cos\left(2f\right)\right)\left(\frac{-e^{-cf}}{c}\right)$$

$$\int_5^{\infty}\left(\frac{1}{\sqrt{x^2-25}}\right)dx$$

$$\int\left(x-\frac{1}{x}\right)e^{x^2-2\ln\left(x\right)}dx$$

$$-3\left(2x\right)^2\left(-2\right)$$

$$e^{3y}dy=e^{2x}dx$$

$$\int\left(t^2+sec^2\cdot t\right)dt$$