$$\frac{2x}{5a}+\frac{8x}{5a}$$

$$\left(rsin\left(x\right)\right)\left(cos\left(x\right)\right)$$

$$x^2-5x=-3$$

$$\frac{-25xy}{15x}$$

$$\int_2^3\left(\frac{1}{\ln\left(x\right)}\right)dx$$

$$\int\frac{2x^2+6x}{\left(x^2+1\right)\left(x^2+2\right)}dx$$

$$162\cdot3$$