Use half-angle formulas and the following angle below to match each trig ratio to its exact value.
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Write the expression in terms of the first power of cosine.
Write the product as a sum or difference.
Write the product as a sum or difference.
Write the sum as a product.
Prove the following identity by putting the steps in logical order by starting with the left side as the first step in the proof and finishing with the right side as the last step in the proof.
Prove the following identity.