✨ Best Answer ✨
(2sinθ + 3cosθ)² + (3sinθ - 2cosθ)²
= (4sin²θ + 12sinθcosθ + 9cos²θ) + (9sin²θ - 12sinθcosθ + 4cos²θ)
= 13(sin²θ + cos²θ)
= 13 (答)
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