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prove that : sin a + sin b + sin c - sin (a+b+c)= 4 sin (a+b/2) sin (b+c/2) sin (c+ a/2)

prove that : sin a + sin b + sin c - sin (a+b+c)= 4 sin (a+b/2) sin (b+c/2) sin (c+ a/2)

Grade:11

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