How do I simplify? sin²x-sinx2/sin²x-4
The simplified expression is
Your input question wasn't really clear, so I'll assume you meant this:
To solve this question, factor out like terms on the top and bottom like you are solving a quadratic. Then, cancel the ones that are in common with the bottom and the top of the fraction.
Here's what that process looks like:
I don't know if this is what you wanted, but this is the answer to the problem I understood. If this isn't what you were asking for, please write a comment letting me know so I can change this.