$$\int\frac{\sqrt{5-x^{2}}}{x^{2}}dx$$

$$n^2-6n+1$$

$$y2-2y+1$$

$$sec\theta\:\left(1-cos\theta\:\right)=sec\theta\:-1$$

$$\int_0^{2\pi\:}cos^2\left(x\right)\cdot\:\:sen\left(x\right)\:dx$$

$$\sqrt[1]{\left(81\right)}4$$

$$\frac{5}{8}\left(s-9\right)$$