c. The Cosine Rule
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E1-10 [Trigonometry: Proof of the Cosine Rule]
E1-10 [Trigonometry: Proof of the Cosine Rule]
E1-11 [Trigonometry: Using the Cosine Rule]
E1-11 [Trigonometry: Using the Cosine Rule]
E1-12 [Trigonometry: Find all the Missing Sides and Angles of a Triangle]
E1-12 [Trigonometry: Find all the Missing Sides and Angles of a Triangle]