SOLUTION: cos5xcos2x+sin5xsin2x= -1 for x is greater or equal to 0, and less than or equal to 2pi

SOLUTION: cos5xcos2x+sin5xsin2x= -1 for x is greater or equal to 0, and less than or equal to 2pi

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Question 964658: cos5xcos2x+sin5xsin2x= -1 for x is greater or equal to 0, and less than or equal to 2pi
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Use the identity,

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