$$\frac{3x}{5-4^2}$$

$$sen\left(a\right)=\frac{tan\left(a\right)}{sec\left(a\right)}$$

$$-\ln\left(x\right)+\ln\left(x+1\right)^2+\frac{x}{\left(x+1\right)^2}$$

$$y^2-6y+13y=0$$

$$3\sin^2z$$

$$\left(x^2y^5+x^5y^2\right)^3$$