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We use the sine laws and cosine laws: I 'll give you a hint. 1. Sine law 2. Sine law 3.Sine law 4. Cosine Law 5.Sine law Sine law is , a / sinA , b / sin B , c / sin C Cosine law is , b^2 = a^2 + c^2 - 2ac cosB or cos B = a^2 + c^2 -b^2 / 2ac Substitute and solve :)
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