SOLUTION: What is the maximum and minimum of function y=cos4x-4cos2x+3 and its pi values

SOLUTION: What is the maximum and minimum of function y=cos4x-4cos2x+3 and its pi values

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Question 957695: What is the maximum and minimum of function y=cos4x-4cos2x+3 and its pi values

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Take the derivative and set it equal to zero,

Solutions are when and
Then,
When

When

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