$$4 x ^ { 10 } - 36 \times 5 x + 81$$

$$87-68.6$$

$$\lim_{x\to0}\left(\sqrt[n]{n}\right)$$

$$m^2x^2-x^2\:-m^2a^2+a^2$$

$$\tan30\left(\cos45-\csc60\right)$$

$$\frac{d}{dx}3x^2+6xy^3$$