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Prove that: cos^3A Cos3A + sin^3A.sin 3A=cos^3 2A​
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Prove
that:
cos^3A Cos3A + sin^3A.sin 3A=cos^3 2A​

Prove that: cos^3A Cos3A + sin^3A.sin 3A=cos^3 2A​-example-1
User Strayer
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Prove that: cos^3A Cos3A + sin^3A.sin 3A=cos^3 2A​-example-1
User Leafonsword
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