Question: If a, b, c are the sides of a triangle and A, B, C are the opposite angles, find A/a, A/b, A/c by implicit differentiation

If a, b, c are the sides of a triangle and A, B, C are the opposite angles, find ∂A/∂a, ∂A/∂b, ∂A/∂c by implicit differentiation of the Law of Cosines.

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