Question: If a, b and ZA are given in a triangle and C1, C2 are the possible values of the remaining side, then ci+- 2c1c2

If a, b and ZA are given in a triangle and C1,

If a, b and ZA are given in a triangle and C1, C2 are the possible values of the remaining side, then ci+- 2c1c2 cos 2A is equal to: (A) 2a cos? A (B) 26cos? A (C) 4a cos? A (D) 46cos A

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