What is double angle theroem

1.	What is double angle theroem
Answer» ong>ANSWER: USING the cosine double-angle identity. About Transcript. The cosine double angle formula tells us that cos(2θ) is always EQUAL to cos²θ-sin²θ. For example, cos(60) is equal to cos²(30)-sin²(30). We can use this identity to rewrite expressions or SOLVE problems.

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USING the cosine double-angle identity. About Transcript. The cosine double angle formula tells us that cos(2θ) is always EQUAL to cos²θ-sin²θ. For example, cos(60) is equal to cos²(30)-sin²(30). We can use this identity to rewrite expressions or SOLVE problems.

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What is double angle theroem​

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What is double angle theroem