$\left(2x-1\right)\left(4x-3\right)=8$

$18sin\left(50w\right)sin\left(4w\right)$

$\left(b-7c\right)^2$

$\frac{d}{dx}\left(9+y^2=\frac{x^2}{x+y}\right)$

$1+\tan\left(a\right)\cdot1-\tan\left(a\right)+\sec^2\left(a\right)=2$

$a+b^2+12a+b+36$

$\frac{dy}{dx}=\frac{-y}{x-y+2}$