$\frac{wl}{6}-\frac{1}{2}\left(\frac{wx}{l}\right)x$

$\left(3f+4d\right)\left(3f-4d\right)$

$sec\left(x\right)cos^2\left(x\right)=-.79$

$\frac{y^{-5}}{y^{-6}}$

$\frac{1-2\cos^2x}{\sin x\cos x}$

$\csc\left(a\right)\sec\left(a\right)+\left(\frac{-1}{\tan\left(a\right)}\right)=\tan\left(a\right)$

$\frac{x^{-1}}{x^3+3^2+2x+3}$