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4. Prove the identity 8 sin^2x cos^2x = 1 - cos 4x.​
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4. Prove the identity 8 sin^2x cos^2x = 1 - cos 4x.​

User NNikN
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4. Prove the identity 8 sin^2x cos^2x = 1 - cos 4x.​-example-1
User ZimGil
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