$$\int\frac{1}{\left(4x^2-24x+27\right)}dx$$

$$\frac{x^5-x^4+x^2-2}{x^2+1}8$$

$$2x+7y-5x-2y-y+5x-y$$

$$cos\left(x\right)^2-2sen\left(x\right)^2$$

$$20y^2-y-6$$

$$x+y\cdot1$$

$$\frac{\left(a+2\right)}{4}+\frac{a}{5}=5$$