SOLUTION: Verify the solution and show your work: cos^4X - sin^4X = cos2X

SOLUTION: Verify the solution and show your work: cos^4X - sin^4X = cos2X

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Question 1030550: Verify the solution and show your work:
cos^4X - sin^4X = cos2X
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!

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