Simplify sin θ csc θ − sin2 θ. cos2 θ sin2 θ 2 sin2 θ 1

cos²θ

Explanation:
Before we begin, remember the following:
csc θ is the inverse of the sin θ. This means that csc θ * sin θ = 1
sin²θ + cos²θ = 1

Now, for the given we have:
sin θ csc θ - sin²θ

Applying the first rule mentioned above, we would find that the expression becomes:
1 - sin²θ

Applying the second rule mentioned above, we would find that the expression is equivalent to:
cos²θ

Hope this helps :)