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For any triangle ABC, prove that(b^2-c^2...

For any triangle ABC, prove that`(b^2-c^2)/(a^2)sin2A+(c^2-a^2)/(b^2)sin2B+(a^2-b^2)/(c^2)sin2C=0`

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VMC MODULES ENGLISH-PROPERTIES OF TRIANGLE-JEE Advanced (Archive)
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  6. In a triangle ABC, 2 ac sin (1/2(A-B + C)) =

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