$7s\:+\:6\:-\:8s$

$4x^2-5x+6=0$

$\lim_{x\to+\infty}\left(\frac{4}{x+3}\right)$

$2sen^2\left(x\right)-4sen\left(x\right)+1=0.5$

$\lim_{x\to\infty}\left(\frac{x}{\ln\left(x\right)^{3+2x}}\right)$

$f\:'\left(1\right)=\frac{3}{5\sqrt{x}}-\frac{1}{2x}$

$\frac{\csc^2y-1}{\csc y\cos^2y}$