Math Rendering Check

Math Rendering

1. $sin(\theta) = cos(\frac{\pi}{2} - \theta)$
2. $ sin(\theta) = cos(\frac{\pi}{2} - \theta) $
3. sin(\theta) = cos(\frac{\pi}{2} - \theta)
4. \[sin(\theta) = cos(\frac{\pi}{2} - \theta)\]

For using MathJax to render the math, add the scripts to your default.html file in the layouts directory ,as given by this answer.

So, First of all Why and How do these scripts work and enables MathJax ?, followed by How MathJax works ?.