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Express cos9x cos3x as a sum of two trigonometry function ​

Express cos9x cos3x as a sum of two trigonometry function ​
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Express cos9x cos3x as a sum of two trigonometry function ​

User Noah Richards
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Explanation:

the answer is in the image above

Express cos9x cos3x as a sum of two trigonometry function ​-example-1
User Jwernerny
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