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  • 03-11-2020
  • Mathematics
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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 .

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Аноним Аноним
  • 06-11-2020

Answer:

Answer is power reducing and substitution

Step-by-step explanation:

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