$12\left(1+7x\right)-4\left(-12x-8\right)$

$\frac{3}{x+2}+\frac{2}{x^2-4}$

$x\sin\left(y\right)=x^2\cos\left(y\right)$

$\frac{dy}{dx}=\frac{2x-4y}{6x-12y+1}$

$\left(5x-7z\right)\left(5x+7z\right)$

$1-\frac{\sin\left(x\right)}{\csc\left(x\right)}=\cos^2\left(x\right)$

$4x^2+33x+65$