Analyze the proof. Use the drop-down boxes to complete the sentences. The third line of this proof is known as the . identity of cosine. The justification for the fourth line is . - QAmmunity.org

Analyze the proof. Use the drop-down boxes to complete the sentences. The third line of this proof is known as the . identity of cosine. The justification for the fourth line is .

asked Mar 15, 2021 19.3k views

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