Final answer:
To make the trigonometric substitution, substitute x = 3sinθ into the given expression √(9-x²) and simplify to √(9-9sin²θ).
Step-by-step explanation:
To make the trigonometric substitution, we substitute x = 3sinθ into the given expression √(9-x²).
So, substituting x = 3sinθ gives us: √(9-(3sinθ)²).
Simplifying further, we have: √(9-9sin²θ).
The trigonometric substitution x = 3sinθ simplifies the expression to √(9-9sin²θ).