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Sine and Cosine Rules
The Sine Rule
a / sin A = b / sin B = c / sin C
The Cosine Rule
a2 = b2 + c2 - 2 b c cos A
b2 = a2 + c2 - 2 a c cos B
c2 = a2 + b2 - 2 a b cos C
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Sine and Cosine Rules
The Sine Rule a / sin A = b / sin B = c / sin C The Cosine Rule a2 = b2 + c2 - 2 b c cos A b2 = a2 + c2 - 2 a c cos B c2 = a2 + b2 - 2 a b cos C
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