Solve for u cos(2u)^2-sin(2u)^2=cos(4u)

Solve for u cos(2u)^2-sin(2u)^2=cos(4u)
Move to the left side of the equation by subtracting it from both sides.
Simplify the left side.
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Apply the cosine double-angle identity.
Multiply by .
Subtract from .
Since , the equation will always be true for any value of .
All real numbers
The result can be shown in multiple forms.
All real numbers
Interval Notation:
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