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If the equation a x^2 + bx + c = 0 and 3...

If the equation `a x^2 + bx + c = 0` and `3 x^2 + 8x +15 = 0` have a common root, where a,b,c are the length of the side a `Delta ABC`, then `sin^2 A + sin^2 B + sin^2 C` is equal to

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