Hello Everyone, I have another question again... In any acute-angle triangle ABC, prove that: b^2sin2C + c^2sin2B = 2bcsinA Does it have to do with sine law and cosine law? I can't figure it out.
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Originally Posted by KelvinScale Hello Everyone, I have another question again... In any acute-angle triangle ABC, prove that: b^2sin2C + c^2sin2B = 2bcsinA Does it have to do with sine law and cosine law? I can't figure it out. Now from the cosine rule: . Similarly . So We also know from the sine rule: so . Similarly . So .
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