$$\cos^225-\sin^225$$

$$\left(\frac{2y}{6}\right)^2$$

$$\left(m\:+\:n\right)\left(m\:-\:3n\right)$$

$$96:\left(-8\right)$$

$$\sin\left(2x\right)\cdot\cos\left(x\right)=2\cdot\sin^3\left(x\right)$$

$$\left(x^{-2}-x^{\frac{3}{2}}\right)\cdot\left(-3x^{-4}+4x-3\right)$$

$$2-3\:x\:1$$