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Using the sine rule , prove the cosine r...

Using the sine rule , prove the cosine rule.

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To prove the cosine rule using the sine rule, we will follow a systematic approach. ### Step-by-Step Solution: 1. **State the Sine Rule**: The sine rule states that for a triangle with sides \( a, b, c \) opposite to angles \( A, B, C \) respectively: \[ \frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C} = k ...
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