$\left(196a\:+78b\:-14c\:-19\right)\:+\:\left(114b\:-18a\:-117c\:-198\right)\:+\:\left(a\:+\:b\:-\:c\:+156\right)$

$\frac{1-\sec^2\left(x\right)}{\tan^2\left(x\right)}$

$\left(5x\:+\:3\right)\:.\:\left(4x\:-\:7\right)$

$cos\theta\left(2sin\theta-1\right)=0$

$\int\frac{6x^2-7x+7}{\left(x-3\right)\left(x^2+1\right)}dx$

$\lim_{x\to0}x\tan\left(x\right)$

$81w^2-18w-1$