$$tan^2x=2secx+2$$

$$\left(x^4+2x^2\right)^2$$

$$\int\frac{20x^2}{\left(x+1\right)^2\left(x-1\right)}dx$$

$$3\left(x+h\right)^2$$

$$\lim_{x\to+0}\left(\frac{1}{2x}-\frac{1}{sinx}\right)$$

$$0\cdot256$$

$$\sqrt[3]{27a^4b^6c^7}$$