$-2-5-6+2+8+3$

$\frac{dy}{dx}\left(\frac{2xy}{y-1}\right)$

$\cos\left(3x\right)-\cos^3\left(x\right)-\frac{3}{2}\sin\left(x\right)\sin\left(2x\right)$

$3\sin^2\theta\:+sin\theta\:=0$

$\left(3z+y\right)\left(3z-y\right)$

$\left(6y^2+5bx^3\right)\cdot\left(36y^4-30bx^6y^2+25x^6b^2\right)$

$\frac{2x+5}{-4x+8}$