$$\int\left(\frac{2\cos\left(x\right)}{\sqrt{4-4\sin^2\left(x\right)}}\right)dx$$

$$\frac{sec\left(x\right)tan\left(x\right)}{\sin\left(x\right)}=sec^2\left(x\right)$$

$$\int18x^2e^{x^3}dx$$

$$\frac{2x^2-23x+66}{2x^2+x+1}$$

$$\sqrt[3]{8+i}$$

$$\int\frac{2x+1}{\sqrt{x^2-4x}}dx$$

$$\cot\left(\cos\left(\frac{\sqrt{13}}{7}\right)\right)$$