$$\frac{1}{x^2cosy+x^2}$$

$$mercury$$

$$\left(2\sqrt{a}-3\sqrt{b}\right)\left(3\sqrt{a}+5\sqrt{b}\right)$$

$$\:\left(m\:+\:1\right)^2$$

$$+7^3-3^3$$

$$\frac{d}{dx}\left(x^3\sin\left(y^2\right)+y^2\cos\left(x^3\right)=1\right)$$

$$t^2-12tw+36w^2$$