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1. যদি A+B+C= π হয় তবে sin2 A2+sin2 B2+sin2 C2 সমান−

  • A. 1-2 sin A2sin B
  • B. 1-2 sin A2sin B
  • C. 1-2 sin A2sin B
  • D. 1-2 sin A2sin B

Answer: Option A

Explanation:

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