Complete the most suitable text at the location of the <MASK>.
The <MASK> is located within a Markdown math block.
Your answer must only contain LaTeX code that captures the math discussed in the surrounding text. 
Your answer must not contain any text that is not part of the LaTeX code.
Your answer must be written in the same language as the surrounding text.
Your answer must not overlap with any text adjacent to the <MASK>.
Your answer must have the following format:
<LANGUAGE>
Here, you write the language of your response e.g. English, Chinese, TypeScript, Python.
<THOUGHT>
Here, you reason about the answer, using the 80/20 rule for clarity and conciseness.
<INSERT>
Here, you write the text that should be inserted at the location of the <MASK>.