$\frac{1}{\cos\left(x\right)}\:-\:\frac{\sin^2\left(x\right)}{cos\left(x\right)}$
$2\cos\left(2x\right)+4\sin\left(x\right)+1=0$
$w^2+20w$
$\int_1^{\infty}\left(\frac{2e^{3k}}{1+e^{6k}}\right)dx$
$x^2-16x+91$
$2\tan-\sec^2$
$\frac{x+3x^2}{3}=\frac{1}{3}$
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