Prove that (cos A - cos B)² + (sin A - sin B)² = 4sin² ((A-B)/2)

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Prove that (cos A - cos B)² + (sin A - sin B)² = 4sin² ((A-B)/2)
In this video, you get the full concept of the submultiple angle of trigonometry.
  1. Mr. Bidur Bastola
  2. Mr. Bidur Bastola
  3. Trigonometry
  4. Multiple angles
  5. Sub- multiple angles
  6. Important question from trigonometry
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Question:
If tan a/2 = [√(1-m)/(1+m)] tan b/2 prove that cos b= (cos a-m)/(1-m cos a).
Pls solve soon😢

Stickmanwitkatana
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