$\left(\frac{1}{3}x+2\right)\frac{1}{3}x-2$

$\frac{1}{1-\sin^2a}$

$\frac{sec\:x\:tan\:x}{cot^2xcsc\:x}$

$\frac{2}{5}\cdot\left(\frac{1}{5}\right)^{-1}+\left(\frac{3}{2}\right)^{-2}\cdot\left(2-5\right)$

$4x+56\ge104$

$x^2-196=0$

$csc\theta\:\:sin2\theta\:-sec\theta\:=cos2\theta\:\:sec\theta\:$