Prove that \(sin\ x + sin\ 3x + sin\ 5x + sin\ 7x = 4cos\ x \cdot cos\ 2x \cdot sin\ 4x\)...

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PW Solutions
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SiN (1998)
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Prove that
\(sin\ x + sin\ 3x + sin\ 5x + sin\ 7x = 4cos\ x \cdot cos\ 2x \cdot sin\ 4x\)...
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