$$\sin\left(\theta\:\right)\cot\left(\theta\:\right)\sec\left(\theta\:\right)=1$$

$$\tan^2\left(y\right)+\sec^2\left(y\right)$$

$$2\cdot\frac{\left(6.24\cdot10^{18}\right)}{100}$$

$$\left(1-4ax\right)\left(1-4ax\right)\left(1-4ax\right)$$

$$\lim_{x\to4}\:\frac{20-5x}{x^2+2x-1}$$

$$3x^6+18$$

$$3x^0y^2$$