$$\left(\sqrt[3]{mn}\right)^{21}.\left(\sqrt{mn}\right)^4$$

$$\frac{e^x}{e^{2x}}$$

$$\frac{1}{sin\left(x\right)}=\sin\left(x\right)+\cos\left(x\right)\cot\left(x\right)$$

$$2-\left(7-5\right)$$

$$\left(x-5\right)^5\frac{dy}{dx}+6\left(x-5\right)^4y=x+5$$

$$3x^2+x-4$$

$$\int_1^2\left(\frac{1}{\left(\left(x-3\right).\left(x-1\right)\right)}\right)dx$$