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Verify That Each Equation Is an Identity cos(4u)=2cos2(2u)1\cos ( 4 u ) = 2 \cos ^ { 2 } ( 2 u ) - 1

Question 207

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Verify that each equation is an identity.
- cos(4u)=2cos2(2u)1\cos ( 4 u ) = 2 \cos ^ { 2 } ( 2 u ) - 1

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