SOLUTION: prove: sinx - sinx cos2x =sin3x

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Question 1093074: prove: sinx - sinx cos2x =sin3x
Answer by Alan3354(69443) About Me  (Show Source):
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prove: sinx - sinx cos2x =sin3x
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Is it cos^2(x) ?
Or cos(2x) ?
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Parentheses are free. Use some.